ATmega32A Datasheet - Sunrom Technologies

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<strong>ATmega32A</strong>12.4.13 PIND – Port D Input Pins AddressBit 7 6 5 4 3 2 1 0PIND7 PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0 PINDRead/Write R R R R R R R RInitial Value N/A N/A N/A N/A N/A N/A N/A N/A8155C–AVR–02/1168
<strong>ATmega32A</strong>13. External Interrupts13.1 Register DescriptionThe External Interrupts are triggered by the INT0, INT1, and INT2 pins. Observe that, if enabled,the interrupts will trigger even if the INT0:2 pins are configured as outputs. This feature providesa way of generating a software interrupt. The external interrupts can be triggered by a falling orrising edge or a low level (INT2 is only an edge triggered interrupt). This is set up as indicated inthe specification for the MCU Control Register – MCUCR – and MCU Control and Status Register– MCUCSR. When the external interrupt is enabled and is configured as level triggered (onlyINT0/INT1), the interrupt will trigger as long as the pin is held low. Note that recognition of fallingor rising edge interrupts on INT0 and INT1 requires the presence of an I/O clock, described in“Clock Systems and their Distribution” on page 25. Low level interrupts on INT0/INT1 and theedge interrupt on INT2 are detected asynchronously. This implies that these interrupts can beused for waking the part also from sleep modes other than Idle mode. The I/O clock is halted inall sleep modes except Idle mode.Note that if a level triggered interrupt is used for wake-up from Power-down mode, the changedlevel must be held for some time to wake up the MCU. This makes the MCU less sensitive tonoise. The changed level is sampled twice by the Watchdog Oscillator clock. The period of theWatchdog Oscillator is 1 µs (nominal) at 5.0V and 25°C. The frequency of the Watchdog Oscillatoris voltage dependent as shown in “Electrical Characteristics” on page 296. The MCU willwake up if the input has the required level during this sampling or if it is held until the end of thestart-up time. The start-up time is defined by the SUT fuses as described in “System Clock andClock Options” on page 25. If the level is sampled twice by the Watchdog Oscillator clock butdisappears before the end of the start-up time, the MCU will still wake up, but no interrupt will begenerated. The required level must be held long enough for the MCU to complete the wake up totrigger the level interrupt.13.1.1 MCUCR – MCU Control RegisterThe MCU Control Register contains control bits for interrupt sense control and general MCUfunctions.Bit 7 6 5 4 3 2 1 0SE SM2 SM1 SM0 ISC11 ISC10 ISC01 ISC00 MCUCRRead/Write R/W R/W R/W R/W R/W R/W R/W R/WInitial Value 0 0 0 0 0 0 0 0• Bit 3, 2 – ISC11, ISC10: Interrupt Sense Control 1 Bit 1 and Bit 0The External Interrupt 1 is activated by the external pin INT1 if the SREG I-bit and the correspondinginterrupt mask in the GICR are set. The level and edges on the external INT1 pin thatactivate the interrupt are defined in Table 13-1. The value on the INT1 pin is sampled beforedetecting edges. If edge or toggle interrupt is selected, pulses that last longer than one clockperiod will generate an interrupt. Shorter pulses are not guaranteed to generate an interrupt. If8155C–AVR–02/1169
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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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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
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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
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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
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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
Page 64 and 65: ATmega32ATable 12-11. Overriding Si
Page 66 and 67: ATmega32A12.4 Register Description1
Page 70 and 71: ATmega32Alow level interrupt is sel
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Page 75 and 76: ATmega32ASignal description (intern
Page 77 and 78: ATmega32Athe OCR0 value, the compar
Page 79 and 80: ATmega32AFigure 14-5.CTC Mode, Timi
Page 81 and 82: ATmega32AThe PWM resolution for the
Page 83 and 84: ATmega32AFigure 14-9. Timer/Counter
Page 85 and 86: ATmega32ATable 14-2. Waveform Gener
Page 87 and 88: ATmega32AThe Output Compare Registe
Page 89 and 90: ATmega32AFigure 15-1.T1/T0 Pin Samp
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Page 93 and 94: ATmega32Aput Compare Units” on pa
Page 95 and 96: ATmega32Athe main code and the inte
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Page 99 and 100: ATmega32AThe ICR1 Register can only
Page 101 and 102: ATmega32ARegister to either TOP or
Page 103 and 104: ATmega32AA change of the COM1x1:0 b
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Page 110: ATmega32AUsing the ICR1 Register fo
Page 113 and 114: ATmega32ATable 16-3 shows the COM1x
Page 115 and 116: ATmega32A• Bit 7 - ICNC1: Input C
Page 117 and 118: 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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