Atmel Tmega48P Manuals

Manuals and User Guides for Atmel Tmega48P. We have 1 Atmel Tmega48P manual available for free PDF download: Manual

Atmel Tmega48P Manual (452 pages)

8-bit Microcontroller with 4/8/16/32K Bytes In-System Programmable Flash

Brand: Atmel | Category: Microcontrollers | Size: 8.52 MB

Features

1
1 Pin Configurations

2
- Pin Descriptions
  3
2 Overview

4
- Block Diagram
  5
- Comparison between Atmega48P, Atmega88P, Atmega168P, and Atmega328P
  6
3 About

7
- Disclaimer
  7
- Resources
  7
- Data Retention
  7
- Code Examples
  7
4 AVR CPU Core

8
- Overview
  8
- ALU - Arithmetic Logic Unit
  9
- Status Register
  9
- General Purpose Register File
  11
- Stack Pointer
  12
- Instruction Execution Timing
  13
- Reset and Interrupt Handling
  14
5 AVR Memories

16
- Overview
  16
- In-System Reprogrammable Flash Program Memory
  16
- SRAM Data Memory
  18
- EEPROM Data Memory
  19
- I/O Memory
  20
- Register Description
  21
6 System Clock and Clock Options

26
- Clock Systems and Their Distribution
  26
- Clock Sources
  27
- Low Power Crystal Oscillator
  28
- Full Swing Crystal Oscillator
  30
- Low Frequency Crystal Oscillator
  32
- Calibrated Internal RC Oscillator
  33
- Khz Internal Oscillator
  33
- External Clock
  34
- Clock Output Buffer
  35
- Timer/Counter Oscillator
  35
- System Clock Prescaler
  35
- Register Description
  37
7 Power Management and Sleep Modes

39
- Sleep Modes
  39
- BOD Disable
  40
- Idle Mode
  40
- ADC Noise Reduction Mode
  40
- Power-Down Mode
  41
- Power-Save Mode
  41
- Standby Mode
  41
- Extended Standby Mode
  41
- Power Reduction Register
  42
- Minimizing Power Consumption
  42
- Register Description
  44
8 System Control and Reset

46
- Resetting the AVR
  46
- Reset Sources
  46
- Power-On Reset
  47
- External Reset
  48
- Brown-Out Detection
  48
- Watchdog System Reset
  49
- Internal Voltage Reference
  49
- Watchdog Timer
  50
- Register Description
  54
9 Interrupts

57
10 External Interrupts

70
- Pin Change Interrupt Timing
  70
- Register Description
  71
11 O-Ports

75
- Overview
  75
- Ports as General Digital I/O
  76
- Alternate Port Functions
  80
- Register Description
  92
12 8-Bit Timer/Counter0 with PWM

94
- Features
  94
- Overview
  94
- Timer/Counter Clock Sources
  96
- Counter Unit
  96
- Output Compare Unit
  97
- Compare Match Output Unit
  98
- Modes of Operation
  99
- Timer/Counter Timing Diagrams
  104
- Register Description
  106
16 Bit Timer/Counter1 with PWM

113
- Features
  113
- Overview
  113
- Accessing 16-Bit Registers
  115
- Timer/Counter Clock Sources
  118
- Counter Unit
  119
- Input Capture Unit
  120
- Output Compare Units
  122
- Compare Match Output Unit
  124
- Modes of Operation
  125
- Timer/Counter Timing Diagrams
  132
- Register Description
  134
14 Timer/Counter0 and Timer/Counter1 Prescalers

141
- Internal Clock Source
  141
- Prescaler Reset
  141
- External Clock Source
  141
- Register Description
  143
15 8-Bit Timer/Counter2 with PWM and Asynchronous Operation

144
- Features
  144
- Overview
  144
- Timer/Counter Clock Sources
  145
- Counter Unit
  145
- Output Compare Unit
  146
- Compare Match Output Unit
  148
- Modes of Operation
  149
- Timer/Counter Timing Diagrams
  153
- Asynchronous Operation of Timer/Counter2
  155
- Timer/Counter Prescaler
  156
- Register Description
  158
16 SPI - Serial Peripheral Interface

166
- Features
  166
- Overview
  166
- SS Pin Functionality
  171
- Data Modes
  171
- Register Description
  173
17 Usart0

176
- Features
  176
- Overview
  176
- Clock Generation
  177
- Frame Formats
  180
- USART Initialization
  182
- Data Transmission - the USART Transmitter
  183
- Data Reception - the USART Receiver
  186
- Asynchronous Data Reception
  190
- Multi-Processor Communication Mode
  193
- Register Description
  195
- Examples of Baud Rate Setting
  199
18 USART in SPI Mode

204
- Features
  204
- Overview
  204
- Clock Generation
  204
- SPI Data Modes and Timing
  205
- Frame Formats
  206
- Data Transfer
  208
- AVR USART MSPIM Vs. AVR SPI
  210
- Register Description
  211
19 2-Wire Serial Interface

214
- Features
  214
- Wire Serial Interface Bus Definition
  214
- Data Transfer and Frame Format
  216
- Multi-Master Bus Systems, Arbitration and Synchronization
  218
- Overview of the TWI Module
  221
- Using the TWI
  223
- Transmission Modes
  227
- Multi-Master Systems and Arbitration
  240
- Register Description
  241
20 Analog Comparator

246
- Overview
  246
- Analog Comparator Multiplexed Input
  246
- Register Description
  247
21 Analog-To-Digital Converter

250
- Features
  250
- Overview
  250
- Starting a Conversion
  252
- Prescaling and Conversion Timing
  253
- Changing Channel or Reference Selection
  255
- ADC Noise Canceler
  256
- ADC Conversion Result
  261
- Temperature Measurement
  261
- Register Description
  262
22 Debugwire On-Chip Debug System

267
- Features
  267
- Overview
  267
- Physical Interface
  267
- Software Break Points
  268
- Limitations of Debugwire
  268
- Register Description
  268
23 Self-Programming the Flash, Atmega48P

269
- Overview
  269
- Addressing the Flash During Self-Programming
  270
- Register Description
  275
24 Boot Loader Support - Read-While-Write Self-Programming, Atmega88P, Atmega168P and Atmega328P

277
- Features
  277
- Overview
  277
- Application and Boot Loader Flash Sections
  277
- Read-While-Write and no Read-While-Write Flash Sections
  278
- Boot Loader Lock Bits
  280
- Entering the Boot Loader Program
  281
- Addressing the Flash During Self-Programming
  282
- Self-Programming the Flash
  282
- Register Description
  292
25 Memory Programming

294
- Program and Data Memory Lock Bits
  294
- Fuse Bits
  295
- Signature Bytes
  298
- Calibration Byte
  299
- Page Size
  299
- Parallel Programming Parameters, Pin Mapping, and Commands
  299
- Parallel Programming
  301
- Serial Downloading
  308
26 Electrical Characteristics

313
- Absolute Maximum Ratings
  313
- DC Characteristics
  313
- Speed Grades
  316
- Clock Characteristics
  319
- System and Reset Characteristics
  320
- SPI Timing Characteristics
  321
- Wire Serial Interface Characteristics
  323
- ADC Characteristics - Preliminary Data
  325
- Parallel Programming Characteristics
  326
27 Typical Characteristics

328
28 Register Summary

425
29 Instruction Set Summary

429
30 Ordering Information

432
- Atmega48P
  432
- Atmega88P
  433
- Atmega168P
  434
- Atmega328P
  435
31 Packaging Information

436
- M1-A
  438
32 Errata

440
- Errata Atmega48P
  440
- Errata Atmega88P
  440
- Errata Atmega168P
  440
- Errata Atmega328P
  440
33 Datasheet Revision History

442
- Rev. 2545I-02/09
  442
- Rev. 2545H-02/09
  442
- Rev. 2545G-01/09
  442
- Rev. 2545F-08/08
  443
- Rev. 2545E-08/08
  443
- Rev. 2545D-03/08
  443
- Rev. 2545C-01/08
  443
- Rev. 2545B-01/08
  444
- Rev. 2545A-07/07
  444

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Table of Contents

Features

1 Pin Configurations

2 Overview

3 About

4 AVR CPU Core

5 AVR Memories

6 System Clock and Clock Options

7 Power Management and Sleep Modes

8 System Control and Reset

9 Interrupts

10 External Interrupts

11 O-Ports

12 8-Bit Timer/Counter0 with PWM

16 Bit Timer/Counter1 with PWM

14 Timer/Counter0 and Timer/Counter1 Prescalers

15 8-Bit Timer/Counter2 with PWM and Asynchronous Operation

16 SPI - Serial Peripheral Interface

17 Usart0

18 USART in SPI Mode

19 2-Wire Serial Interface

20 Analog Comparator

21 Analog-To-Digital Converter

22 Debugwire On-Chip Debug System

23 Self-Programming the Flash, Atmega48P

24 Boot Loader Support - Read-While-Write Self-Programming, Atmega88P, Atmega168P and Atmega328P

25 Memory Programming

26 Electrical Characteristics

27 Typical Characteristics

28 Register Summary

29 Instruction Set Summary

30 Ordering Information

31 Packaging Information

32 Errata

33 Datasheet Revision History

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