ATmega32A Datasheet - Sunrom Technologies

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<strong>ATmega32A</strong>1. Power-up sequence:Apply power between V CC and GND while RESET and SCK are set to “0”. In some systems,the programmer can not guarantee that SCK is held low during power-up. In thiscase, RESET must be given a positive pulse of at least two CPU clock cycles durationafter SCK has been set to “0”.2. Wait for at least 20ms and enable SPI Serial Programming by sending the ProgrammingEnable serial instruction to pin MOSI.3. The SPI Serial Programming instructions will not work if the communication is out ofsynchronization. When in sync. the second byte ($53), will echo back when issuing thethird byte of the Programming Enable instruction. Whether the echo is correct or not, allfour bytes of the instruction must be transmitted. If the $53 did not echo back, giveRESET a positive pulse and issue a new Programming Enable command.4. The Flash is programmed one page at a time (page size found in “Page Size” on page269). The memory page is loaded one byte at a time by supplying the 6 LSB of theaddress and data together with the Load Program Memory Page instruction. To ensurecorrect loading of the page, the data low byte must be loaded before data high byte isapplied for a given address. The Program Memory Page is stored by loading the WriteProgram Memory Page instruction with the 8 MSB of the address. If polling is not used,the user must wait at least t WD_FLASH before issuing the next page. (See Table 26-13).Accessing the SPI Serial Programming interface before the Flash write operation completescan result in incorrect programming.5. The EEPROM array is programmed one byte at a time by supplying the address anddata together with the appropriate Write instruction. An EEPROM memory location isfirst automatically erased before new data is written. If polling is not used, the user mustwait at least t WD_EEPROM before issuing the next byte. (See Table 26-13). In a chiperased device, no $FFs in the data file(s) need to be programmed.6. Any memory location can be verified by using the Read instruction which returns thecontent at the selected address at serial output MISO.7. At the end of the programming session, RESET can be set high to commence normaloperation.8. Power-off sequence (if needed):Set RESET to “1”.Turn V CC power off.26.9.2 Data Polling FlashWhen a page is being programmed into the Flash, reading an address location within the pagebeing programmed will give the value $FF. At the time the device is ready for a new page, theprogrammed value will read correctly. This is used to determine when the next page can be written.Note that the entire page is written simultaneously and any address within the page can beused for polling. Data polling of the Flash will not work for the value $FF, so when programmingthis value, the user will have to wait for at least t WD_FLASH before programming the next page. Asa chip erased device contains $FF in all locations, programming of addresses that are meant tocontain $FF, can be skipped. See Table 26-13 for t WD_FLASH value26.9.3 Data Polling EEPROMWhen a new byte has been written and is being programmed into EEPROM, reading theaddress location being programmed will give the value $FF. At the time the device is ready for anew byte, the programmed value will read correctly. This is used to determine when the nextbyte can be written. This will not work for the value $FF, but the user should have the following inmind: As a chip erased device contains $FF in all locations, programming of addresses that aremeant to contain $FF, can be skipped. This does not apply if the EEPROM is re-programmed8155C–AVR–02/11282
<strong>ATmega32A</strong>without chip erasing the device. In this case, data polling cannot be used for the value $FF, andthe user will have to wait at least t WD_EEPROM before programming the next byte. See Table 26-13for t WD_EEPROM value.Table 26-13.Symbolt WD_FLASHt WD_EEPROMt WD_ERASEt WD_FUSEMinimum Wait Delay before Writing the Next Flash or EEPROM LocationMinimum Wait Delay4.5ms9.0ms9.0ms4.5msFigure 26-11. SPI Serial Programming WaveformsSERIAL DATA INPUT(MOSI)MSBLSBSERIAL DATA OUTPUT(MISO)MSBLSBSERIAL CLOCK INPUT(SCK)SAMPLE8155C–AVR–02/11283
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ATmega32A2. OverviewThe Atmel ® AV
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ATmega32Ametrical drive characteris
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ATmega32A6.3.1 SREG - AVR Status Re
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ATmega32A6.4.1 The X-register, Y-re
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ATmega32AFigure 6-5.Single Cycle AL
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ATmega32AA return from an interrupt
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ATmega32AFigure 7-2.Data Memory Map
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ATmega32AEEPROM data corruption can
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ATmega32ASupport - Read-While-Write
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ATmega32AThe next code examples sho
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ATmega32A8.1.3 Flash Clock - clk FL
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ATmega32AThe CKSEL0 Fuse together w
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ATmega32A8.7 Calibrated Internal RC
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ATmega32A8.10 Register Description8
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ATmega32Aface, Timer/Counters, Watc
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ATmega32A9.8.4 Internal Voltage Ref
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ATmega32A10. System Control and Res
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ATmega32AFigure 10-3.MCU Start-up,
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ATmega32AADC is used. To reduce pow
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ATmega32AThe WDP2, WDP1, and WDP0 b
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ATmega32Athe case if the Reset Vect
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ATmega32A$382D out SPL,r16$382E sei
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ATmega32A12. I/O Ports12.1 Overview
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ATmega32AIf PORTxn is written logic
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ATmega32AThe following code example
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ATmega32AFigure 12-5. Alternate Por
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ATmega32ATable 12-3.Table 12-4 and
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ATmega32A• MOSI - Port B, Bit 5MO
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ATmega32A12.3.3 Alternate Functions
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ATmega32ATable 12-11. Overriding Si
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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 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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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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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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Page 237 and 238: ATmega32AThe active states are:•
Page 239 and 240: ATmega32AFigure 24-4. General Port
Page 241 and 242: ATmega32AFigure 24-7.Boundary-scan
Page 243 and 244: ATmega32ATable 24-4.SignalNameBound
Page 245 and 246: ATmega32ATable 24-5.SignalNameBound
Page 247 and 248: ATmega32ATable 24-6.Algorithm for U
Page 249 and 250: ATmega32ATable 24-7. ATmega32A Boun
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Page 257 and 258: ATmega32Amemory by SPM instruction.
Page 259 and 260: ATmega32ANotes: 1. The different va
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Page 263 and 264: ATmega32Asbiw loophi:looplo, 2brne
Page 265 and 266: ATmega32A25.9 Register Description2
Page 267 and 268: ATmega32A26. Memory Programming26.1
Page 269 and 270: ATmega32ATable 26-4.Fuse Low ByteFu
Page 271 and 272: ATmega32ATable 26-7.Signal Name inP
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Page 287 and 288: ATmega32A• Update-DR: The program
Page 289 and 290: ATmega32AFigure 26-14. Programming
Page 291 and 292: ATmega32AFigure 26-15. JTAG Program
Page 293 and 294: ATmega32AFigure 26-17. Virtual Flas
Page 295 and 296: ATmega32A26.10.18 Reading the Flash
Page 297 and 298: ATmega32A27. Electrical Characteris
Page 299 and 300: ATmega32A27.3 Speed GradesFigure 27
Page 301 and 302: ATmega32Aantees that a Brown-out Re
Page 303 and 304: ATmega32ATable 27-3. SPI Timing Par
Page 305 and 306: ATmega32ATable 27-5. ADC Characteri
Page 307 and 308: ATmega32A28. Typical Characteristic
Page 309 and 310: ATmega32AFigure 28-4.Active Supply
Page 311 and 312: ATmega32AFigure 28-8.Idle Supply Cu
Page 313 and 314: ATmega32AFigure 28-12. Idle Supply
Page 315 and 316: ATmega32A28.5 Standby Supply Curren
Page 317 and 318: ATmega32AFigure 28-20. Reset Pull-u
Page 319 and 320: ATmega32AFigure 28-24. I/O Pin Sink
Page 321 and 322: ATmega32AFigure 28-28. Reset Input
Page 323 and 324: ATmega32AFigure 28-32. BOD Threshol
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Page 331 and 332: 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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