Atmel ATmega32M1

Atmel ATmega32M1

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343

7647H–AVR–03/12

Atmel ATmega16/32/64/M1/C1

Figure 27-32. Calibrated 8MHz RC Oscillator Frequency verus Temperature

Figure 27-33. Calibrated 8MHz RC Oscillator Frequency versus V

CC

Figure 27-34. Calibrated 8MHz RC Oscillator Frequency versus Osccal Value

Table of Contents

Default Chapter1
- Features1
1 Pin Configurations3
- Pin Descriptions5
2 Overview8
- Block Diagram8
- Automotive Quality Grade9
- Pin Descriptions10
- About Code Examples11
3 AVR CPU Core12
- Introduction12
- Architectural Overview12
- ALU - Arithmetic Logic Unit13
- Status Register14
- General Purpose Register File15
- Stack Pointer16
- Instruction Execution Timing17
- Reset and Interrupt Handling17
4 Memories20
- In-System Reprogrammable Flash Program Memory20
- SRAM Data Memory21
- EEPROM Data Memory22
- I/O Memory28
- General Purpose I/O Registers28
5 System Clock29
- Clock Systems and Their Distribution29
- Clock Sources30
- Default Clock Source31
- Low Power Crystal Oscillator31
- Calibrated Internal RC Oscillator33
- Pll34
- 128 Khz Internal Oscillator36
- External Clock36
- Clock Output Buffer37
- System Clock Prescaler37
6 Power Management and Sleep Modes40
- Sleep Mode Control Register40
- Idle Mode41
- ADC Noise Reduction Mode41
- Power-Down Mode41
- Standby Mode42
- Power Reduction Register42
- Minimizing Power Consumption44
7 System Control and Reset46
- Resetting the AVR46
- Reset Sources46
- Internal Voltage Reference51
- Watchdog Timer52
8 Interrupts57
- Interrupt Vectors in Atmega16/32/64/M1/C157
9 I/O-Ports62
- Introduction62
- Ports as General Digital I/O63
- Alternate Port Functions67
- Register Description for I/O-Ports80
10 External Interrupts82
- Pin Change Interrupt Timing82
- External Interrupt Control Register a - EICRA83
11 Timer/Counter0 and Timer/Counter1 Prescalers87
- Internal Clock Source87
- Prescaler Reset87
- External Clock Source87
12 8-Bit Timer/Counter0 with PWM90
- Overview90
- Timer/Counter Clock Sources91
- Counter Unit91
- Output Compare Unit92
- Compare Match Output Unit94
- Modes of Operation95
- Timer/Counter Timing Diagrams99
- 8-Bit Timer/Counter Register Description101
16 Bit Timer/Counter1 with PWM107
- Overview107
- Accessing 16-Bit Registers109
- Timer/Counter Clock Sources112
- Counter Unit113
- Input Capture Unit114
- Output Compare Units116
- Compare Match Output Unit118
- Modes of Operation120
- Timer/Counter Timing Diagrams128
- 16-Bit Timer/Counter Register Description130
14 Power Stage Controller - (PSC) (Only Atmega16/32/64M1)136
- Features136
- Overview136
- Accessing 16-Bit Registers136
- PSC Description137
- Functional Description138
- Update of Values142
- Overlap Protection143
- Signal Description144
- PSC Input146
- PSC Input Modes 001B to 10Xb: Deactivate Outputs Without Changing Timing148
- PSC Input Mode 11Xb: Halt PSC and Wait for Software Action148
- Analog Synchronization149
- Interrupt Handling149
- PSC Clock Sources149
- Interrupts150
- PSC Register Definition151
15 Serial Peripheral Interface - SPI158
- Features158
- SS Pin Functionality163
- Data Modes166
16 Controller Area Network - CAN168
- Features168
- CAN Protocol168
- CAN Controller174
- CAN Channel175
- Message Objects178
- CAN Timer182
- Error Management183
- Interrupts184
- CAN Register Description186
- General CAN Registers187
- Mob Registers196
- Examples of CAN Baud Rate Setting202
17 LIN / UART - Local Interconnect Network Controller or UART204
- LIN Features204
- UART Features204
- LIN Protocol205
- LIN / UART Controller206
- LIN / UART Description212
- LIN / UART Register Description223
18 Analog to Digital Converter - ADC230
- Features230
- Operation232
- Starting a Conversion232
- Prescaling and Conversion Timing233
- Changing Channel or Reference Selection235
- ADC Noise Canceler237
- ADC Conversion Result241
- Temperature Measurement243
- ADC Register Description245
- Amplifier250
- Amplifier Control Registers254
19 ISRC - Current Source258
- Features258
- Typical Applications259
- Control Register261
20 Analog Comparator262
- Features262
- Overview262
- Use of ADC Amplifiers263
- Analog Comparator Register Description264
21 Digital to Analog Converter - DAC270
- Features270
- Operation271
- Starting a Conversion271
- DAC Register Description272
22 Analog Feature Considerations275
- Purpose275
- Use of an Amplifier as Comparator Input275
- Use of an Amplifier as Comparator Input and ADC Input275
- Analog Peripheral Clock Sources276
23 Debugwire On-Chip Debug System277
- Features277
- Overview277
- Physical Interface277
- Software Break Points278
- Limitations of Debugwire278
- Debugwire Related Register in I/O Memory278
24 Boot Loader Support - Read-While-Write Self-Programming Atmega16/32/64/M1/C1279
- Boot Loader Features279
- Application and Boot Loader Flash Sections279
- Read-While-Write and no Read-While-Write Flash Sections280
- Boot Loader Lock Bits282
- Entering the Boot Loader Program283
- Addressing the Flash During Self-Programming285
- Self-Programming the Flash286
25 Memory Programming296
- Program and Data Memory Lock Bits296
- Fuse Bits297
- PSC Output Behavior During Reset298
- Signature Bytes300
- Calibration Byte301
- Parallel Programming Parameters, Pin Mapping, and Commands301
- Serial Programming Pin Mapping304
- Parallel Programming304
- Serial Downloading313
26 Electrical Characteristics317
- Absolute Maximum Ratings317
- DC Characteristics317
- Clock Characteristics319
- External Clock Drive Characteristics319
- Maximum Speed Vs. V320
- PLL Characteristics320
- SPI Timing Characteristics321
- ADC Characteristics322
- Parallel Programming Characteristics324
27 Atmega16/32/64/M1/C1 Typical Characteristics327
- Active Supply Current328
- Idle Supply Current330
- Power-Down Supply Current332
- Pin Pull-Up333
- Pin Driver Strength335
- Pin Thresholds and Hysteresis337
- BOD Thresholds and Analog Comparator Hysterisis340
- Analog Reference342
- Internal Oscillator Speed342
28 Instruction Set Summary344
29 Register Summary347
30 Errata351
- Errata Summary351
31 Ordering Information355
32 Package Information355
- Tqfp32356
- Qfn32357
33 Datasheet Revision History for Atmega16/32/64/M1/C1358

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