ATmega32A Datasheet - Sunrom Technologies

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ATmega32AFigure 7-2.Data Memory MapRegister FileR0R1R2...Data Address Space$0000$0001$0002...R29R30R31I/O Registers$00$01$02...$3D$3E$3F$001D$001E$001F$0020$0021$0022...$005D$005E$005FInternal SRAM$0060$0061...$085E$085F7.3.1 Data Memory Access TimesThis section describes the general access timing concepts for internal memory access. Theinternal data SRAM access is performed in two clk CPU cycles as described in Figure 7-3.Figure 7-3.On-chip Data SRAM Access CyclesT1 T2 T3clkCPUAddressCompute AddressAddress ValidDataWRDataRDRead WriteMemory Access InstructionNext Instruction8155C–AVR–02/1118
ATmega32A7.4 EEPROM Data MemoryThe Atmel ® AVR ® ATmega32A contains 1024bytes of data EEPROM memory. It is organized asa separate data space, in which single bytes can be read and written. The EEPROM has anendurance of at least 100,000 write/erase cycles. The access between the EEPROM and theCPU is described in the following, specifying the EEPROM Address Registers, the EEPROMData Register, and the EEPROM Control Register.“Memory Programming” on page 267 contains a detailed description on EEPROM Programmingin SPI, JTAG, or Parallell Programming mode.7.4.1 EEPROM Read/Write AccessThe EEPROM Access Registers are accessible in the I/O space.The write access time for the EEPROM is given in Table 7-1 on page 22. A self-timing function,however, lets the user software detect when the next byte can be written. If the user code containsinstructions that write the EEPROM, some precautions must be taken. In heavily filteredpower supplies, V CC is likely to rise or fall slowly on Power-up/down. This causes the device forsome period of time to run at a voltage lower than specified as minimum for the clock frequencyused. See “Preventing EEPROM Corruption” on page 19 for details on how to avoid problems inthese situations.In order to prevent unintentional EEPROM writes, a specific write procedure must be followed.Refer to the description of the EEPROM Control Register for details on this.When the EEPROM is read, the CPU is halted for four clock cycles before the next instruction isexecuted. When the EEPROM is written, the CPU is halted for two clock cycles before the nextinstruction is executed.7.4.2 EEPROM Write During Power-down Sleep ModeWhen entering Power-down Sleep mode while an EEPROM write operation is active, theEEPROM write operation will continue, and will complete before the Write Access time haspassed. However, when the write operation is completed, the Oscillator continues running, andas a consequence, the device does not enter Power-down entirely. It is therefore recommendedto verify that the EEPROM write operation is completed before entering Power-down.7.4.3 Preventing EEPROM CorruptionDuring periods of low V CC, the EEPROM data can be corrupted because the supply voltage istoo low for the CPU and the EEPROM to operate properly. These issues are the same as forboard level systems using EEPROM, and the same design solutions should be applied.An EEPROM data corruption can be caused by two situations when the voltage is too low. First,a regular write sequence to the EEPROM requires a minimum voltage to operate correctly. Secondly,the CPU itself can execute instructions incorrectly, if the supply voltage is too low.8155C–AVR–02/1119
Page 3 and 4: ATmega32A2. OverviewThe Atmel ® AV
Page 5: ATmega32Ametrical drive characteris
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Page 11 and 12: ATmega32A6.4.1 The X-register, Y-re
Page 13 and 14: ATmega32AFigure 6-5.Single Cycle AL
Page 15: ATmega32AA return from an interrupt
Page 20 and 21: ATmega32AEEPROM data corruption can
Page 22 and 23: ATmega32ASupport - Read-While-Write
Page 24 and 25: ATmega32AThe next code examples sho
Page 26 and 27: ATmega32A8.1.3 Flash Clock - clk FL
Page 28 and 29: ATmega32AThe CKSEL0 Fuse together w
Page 30 and 31: ATmega32A8.7 Calibrated Internal RC
Page 32 and 33: ATmega32A8.10 Register Description8
Page 34 and 35: ATmega32Aface, Timer/Counters, Watc
Page 36 and 37: ATmega32A9.8.4 Internal Voltage Ref
Page 38 and 39: ATmega32A10. System Control and Res
Page 40 and 41: ATmega32AFigure 10-3.MCU Start-up,
Page 42 and 43: ATmega32AADC is used. To reduce pow
Page 44 and 45: ATmega32AThe WDP2, WDP1, and WDP0 b
Page 46 and 47: ATmega32Athe case if the Reset Vect
Page 48 and 49: ATmega32A$382D out SPL,r16$382E sei
Page 50 and 51: ATmega32A12. I/O Ports12.1 Overview
Page 52 and 53: ATmega32AIf PORTxn is written logic
Page 54 and 55: ATmega32AThe following code example
Page 56 and 57: ATmega32AFigure 12-5. Alternate Por
Page 58 and 59: ATmega32ATable 12-3.Table 12-4 and
Page 60 and 61: ATmega32A• MOSI - Port B, Bit 5MO
Page 62 and 63: ATmega32A12.3.3 Alternate Functions
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ATmega32A12.4.13 PIND - Port D Inpu
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ATmega32Alow level interrupt is sel
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ATmega32A14. 8-bit Timer/Counter0 w
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ATmega32ASignal description (intern
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ATmega32Athe OCR0 value, the compar
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ATmega32AFigure 14-5.CTC Mode, Timi
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ATmega32AThe PWM resolution for the
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ATmega32AFigure 14-9. Timer/Counter
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ATmega32ATable 14-2. Waveform Gener
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ATmega32AThe Output Compare Registe
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ATmega32AFigure 15-1.T1/T0 Pin Samp
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ATmega32A16. 16-bit Timer/Counter11
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ATmega32Aput Compare Units” on pa
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ATmega32Athe main code and the inte
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ATmega32A16.5 Counter UnitThe main
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ATmega32AThe ICR1 Register can only
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ATmega32ARegister to either TOP or
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ATmega32AA change of the COM1x1:0 b
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ATmega32AThe PWM resolution for the
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ATmega32AUsing the ICR1 Register fo
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ATmega32ATable 16-3 shows the COM1x
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ATmega32A• Bit 7 - ICNC1: Input C
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ATmega32AThe Input Capture is updat
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ATmega32A17. 8-bit Timer/Counter2 w
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ATmega32AFigure 17-2.DATA BUSCounte
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ATmega32AThe setup of the OC2 shoul
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ATmega32AFigure 17-5.CTC Mode, Timi
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ATmega32A17.7.4 Phase Correct PWM M
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ATmega32AFigure 17-9. Timer/Counter
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ATmega32A• If Timer/Counter2 is u
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ATmega32AA FOC2 strobe will not gen
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ATmega32A17.11.2 TCNT2 - Timer/Coun
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ATmega32A17.11.7 SFIOR - Special Fu
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ATmega32Acommunication cycle when p
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ATmega32AAssembly Code Example (1)S
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ATmega32A18.3 SS Pin Functionality1
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ATmega32A18.3.4 SPSR - SPI Status R
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ATmega32A19. USART19.1 Features19.2
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ATmega32A19.2.1 AVR USART vs. AVR U
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ATmega32ATable 19-1.Operating ModeA
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ATmega32AThe frame format used by t
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ATmega32AThe following code example
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ATmega32AThe Transmit Complete (TXC
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ATmega32AAssembly Code Example (1)U
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ATmega32AThe PE bit is set if the n
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ATmega32AFigure 19-7.Stop Bit Sampl
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ATmega32AIf the receiver is set up
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ATmega32AThe following code example
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ATmega32A• Bit 0 - MPCM: Multi-pr
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ATmega32ATable 19-6.USBS Bit Settin
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ATmega32ATable 19-9.BaudRate(bps)Ex
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ATmega32ATable 19-11.BaudRate(bps)E
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ATmega32A20. Two-wire Serial Interf
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ATmega32Acondition is issued betwee
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ATmega32AFigure 20-6.Typical Data T
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ATmega32AFigure 20-9.Overview of th
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ATmega32A20.6 Using the TWIThe AVR
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ATmega32AAssembly code example C ex
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ATmega32ATable 20-2.Status Code(TWS
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ATmega32AFigure 20-12. Formats and
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ATmega32AThe upper seven bits are t
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ATmega32AFigure 20-16. Formats and
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ATmega32A4. The transfer must be fi
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ATmega32A20.9.2 TWCR - TWI Control
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ATmega32A20.9.5 TWAR - TWI (Slave)
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ATmega32A21.3 Register Description2
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ATmega32A22. Analog to Digital Conv
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ATmega32AIf differential channels a
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ATmega32Ain ADCSRA. The prescaler k
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ATmega32ATable 22-1.ConditionADC Co
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ATmega32AIf the user has a fixed vo
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ATmega32AFigure 22-9.ADC Power Conn
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INLATmega32AFigure 22-12. Integral
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ATmega32ATable 22-2.Correlation bet
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ATmega32ATable 22-4.MUX4:011010 ADC
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ATmega32A22.9.4 SFIOR - Special Fun
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ATmega32A• TMS: Test Mode Select.
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ATmega32AThe TMS input must be held
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ATmega32A23.8 Using the JTAG Progra
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ATmega32A24.3.1 Bypass RegisterThe
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ATmega32AThe active states are:•
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ATmega32AFigure 24-4. General Port
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ATmega32AFigure 24-7.Boundary-scan
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ATmega32ATable 24-4.SignalNameBound
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ATmega32ATable 24-5.SignalNameBound
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ATmega32ATable 24-6.Algorithm for U
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ATmega32ATable 24-7. ATmega32A Boun
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ATmega32ATable 24-7. ATmega32A Boun
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ATmega32A25. Boot Loader Support -
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ATmega32AFigure 25-1.Read-While-Wri
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ATmega32Amemory by SPM instruction.
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ATmega32ANotes: 1. The different va
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ATmega32A25.8.8 EEPROM Write Preven
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ATmega32Asbiw loophi:looplo, 2brne
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ATmega32A25.9 Register Description2
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ATmega32A26. Memory Programming26.1
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ATmega32ATable 26-4.Fuse Low ByteFu
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ATmega32ATable 26-7.Signal Name inP
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ATmega32Achanged. A Chip Erase must
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ATmega32AFigure 26-3. Programming t
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ATmega32A3. Set BS1 to “0” and
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ATmega32A26.7.14 Parallel Programmi
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ATmega32A26.9 SPI Serial Programmin
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ATmega32Awithout chip erasing the d
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ATmega32A26.9.4 SPI Serial Programm
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ATmega32A• Update-DR: The program
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ATmega32AFigure 26-14. Programming
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ATmega32AFigure 26-15. JTAG Program
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ATmega32AFigure 26-17. Virtual Flas
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ATmega32A26.10.18 Reading the Flash
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ATmega32A27. Electrical Characteris
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ATmega32A27.3 Speed GradesFigure 27
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ATmega32Aantees that a Brown-out Re
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ATmega32ATable 27-3. SPI Timing Par
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ATmega32ATable 27-5. ADC Characteri
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ATmega32A28. Typical Characteristic
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ATmega32AFigure 28-4.Active Supply
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ATmega32AFigure 28-8.Idle Supply Cu
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ATmega32AFigure 28-12. Idle Supply
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ATmega32A28.5 Standby Supply Curren
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ATmega32AFigure 28-20. Reset Pull-u
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ATmega32AFigure 28-24. I/O Pin Sink
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ATmega32AFigure 28-28. Reset Input
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ATmega32AFigure 28-32. BOD Threshol
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ATmega32AFigure 28-36. Calibrated 8
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ATmega32AFigure 28-48. ADC Current
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ATmega32A28.12 Current Consumption
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ATmega32A29. Register SummaryAddres
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ATmega32A30. Instruction Set Summar
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ATmega32AMnemonics Operands Descrip
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ATmega32A32. Packaging Information3
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ATmega32A32.3 44M1DMarked Pin# 1 ID
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ATmega32A34. Datasheet Revision His
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ATmega32A8.9 Timer/Counter Oscillat
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ATmega32A18.2 Overview ............
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ATmega32A26 Memory Programming ....
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Atmel Corporation2325 Orchard Parkw
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ATmega32A Datasheet - Sunrom Technologies

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