ATmega32A Datasheet - Sunrom Technologies

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<strong>ATmega32A</strong>Figure 22-5.ADC Timing Diagram, Single ConversionOne ConversionNext ConversionCycle Number 1 2 3 4 5 6 7 8 9 10 11 12 13 1 23ADC ClockADSCADIFADCHADCLMSB of ResultLSB of ResultSample & HoldMUX and REFSUpdateConversionCompleteMUX and REFSUpdateFigure 22-6.ADC Timing Diagram, Auto Triggered ConversionOne ConversionNext ConversionCycle Number 1 2 3 4 5 6 7 8 9 10 11 12 131 2ADC ClockTriggerSourceADATEADIFADCHADCLMSB of ResultLSB of ResultPrescalerResetMUX and REFSUpdateSample & HoldConversionCompletePrescalerResetFigure 22-7.ADC Timing Diagram, Free Running ConversionOne ConversionNext ConversionCycle Number11 12 131 23 4ADC ClockADSCADIFADCHMSB of ResultADCLLSB of ResultConversionCompleteSample & HoldMUX and REFSUpdate8155C–AVR–02/11214
<strong>ATmega32A</strong>Table 22-1.ConditionADC Conversion TimeSample & Hold (Cyclesfrom Start of Conversion)Conversion Time (Cycles)First conversion 13.5 25Normal conversions, single ended 1.5 13Auto Triggered conversions 2 13.5Normal conversions, differential 1.5/2.5 13/1422.5.1 Differential Gain ChannelsWhen using differential gain channels, certain aspects of the conversion need to be taken intoconsideration.Differential conversions are synchronized to the internal clock CK ADC2 equal to half the ADCclock. This synchronization is done automatically by the ADC interface in such a way that thesample-and-hold occurs at a specific phase of CK ADC2 . A conversion initiated by the user (that is,all single conversions, and the first free running conversion) when CK ADC2 is low will take thesame amount of time as a single ended conversion (13 ADC clock cycles from the next prescaledclock cycle). A conversion initiated by the user when CK ADC2 is high will take 14 ADC clockcycles due to the synchronization mechanism. In Free Running mode, a new conversion is initiatedimmediately after the previous conversion completes, and since CK ADC2 is high at this time,all automatically started (that is, all but the first) free running conversions will take 14 ADC clockcycles.The gain stage is optimized for a bandwidth of 4kHz at all gain settings. Higher frequencies maybe subjected to non-linear amplification. An external low-pass filter should be used if the inputsignal contains higher frequency components than the gain stage bandwidth. Note that the ADCclock frequency is independent of the gain stage bandwidth limitation. For example, the ADCclock period may be 6 µs, allowing a channel to be sampled at 12kSPS, regardless of the bandwidthof this channel.If differential gain channels are used and conversions are started by Auto Triggering, the ADCmust be switched off between conversions. When Auto Triggering is used, the ADC prescaler isreset before the conversion is started. Since the gain stage is dependent of a stable ADC clockprior to the conversion, this conversion will not be valid. By disabling and then re-enabling theADC between each conversion (writing ADEN in ADCSRA to “0” then to “1”), only extended conversionsare performed. The result from the extended conversions will be valid. See “Prescalingand Conversion Timing” on page 211 for timing details.22.6 Changing Channel or Reference SelectionThe MUXn and REFS1:0 bits in the ADMUX Register are single buffered through a temporaryregister to which the CPU has random access. This ensures that the channels and referenceselection only takes place at a safe point during the conversion. The channel and referenceselection is continuously updated until a conversion is started. Once the conversion starts, thechannel and reference selection is locked to ensure a sufficient sampling time for the ADC. Continuousupdating resumes in the last ADC clock cycle before the conversion completes (ADIF inADCSRA is set). Note that the conversion starts on the following rising ADC clock edge afterADSC is written. The user is thus advised not to write new channel or reference selection valuesto ADMUX until one ADC clock cycle after ADSC is written.8155C–AVR–02/11215
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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 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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Page 165 and 166: ATmega32AIf the receiver is set up
Page 167 and 168: ATmega32AThe following code example
Page 169 and 170: ATmega32A• Bit 0 - MPCM: Multi-pr
Page 171 and 172: ATmega32ATable 19-6.USBS Bit Settin
Page 173 and 174: ATmega32ATable 19-9.BaudRate(bps)Ex
Page 175 and 176: ATmega32ATable 19-11.BaudRate(bps)E
Page 177 and 178: ATmega32A20. Two-wire Serial Interf
Page 179 and 180: ATmega32Acondition is issued betwee
Page 181 and 182: ATmega32AFigure 20-6.Typical Data T
Page 183 and 184: ATmega32AFigure 20-9.Overview of th
Page 185 and 186: ATmega32A20.6 Using the TWIThe AVR
Page 187 and 188: ATmega32AAssembly code example C ex
Page 189 and 190: ATmega32ATable 20-2.Status Code(TWS
Page 191 and 192: ATmega32AFigure 20-12. Formats and
Page 195 and 196: ATmega32AThe upper seven bits are t
Page 197 and 198: ATmega32AFigure 20-16. Formats and
Page 201 and 202: ATmega32A4. The transfer must be fi
Page 203 and 204: ATmega32A20.9.2 TWCR - TWI Control
Page 205 and 206: ATmega32A20.9.5 TWAR - TWI (Slave)
Page 207 and 208: ATmega32A21.3 Register Description2
Page 209 and 210: ATmega32A22. Analog to Digital Conv
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Page 213: ATmega32Ain ADCSRA. The prescaler k
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Page 219 and 220: ATmega32AFigure 22-9.ADC Power Conn
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Page 223 and 224: ATmega32ATable 22-2.Correlation bet
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Page 227 and 228: ATmega32A22.9.4 SFIOR - Special Fun
Page 229 and 230: ATmega32A• TMS: Test Mode Select.
Page 231 and 232: ATmega32AThe TMS input must be held
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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
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Page 247 and 248: ATmega32ATable 24-6.Algorithm for U
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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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