ATMEGA168-20PU Atmel, ATMEGA168-20PU Datasheet - Page 355

• Manufacturer Part Number: ATMEGA168-20PU
• Description: IC AVR MCU 16K 20MHZ 28DIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA168-20PU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Processor Series: ATMEGA16x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: 2-Wire, SPI, USART, Serial
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 6 Channel
• A/d Inputs: 6-Channel, 10-Bit
• Cpu Speed: 20 MIPS
• Eeprom Memory: 512 Bytes
• Input Output: 23
• Interface: I2C/SPI/UART/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin PDIP
• Programmable Memory: 16K Bytes
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 4.5-5.5 V
• Controller Family/series: AVR MEGA
• No. Of I/o's: 23
• Eeprom Memory Size: 512Byte
• Ram Memory Size: 1KB
• Rohs Compliant: Yes
• For Use With: ATSTK600-TQFP32 - STK600 SOCKET/ADAPTER 32-TQFPATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATAVRISP2 - PROGRAMMER AVR IN SYSTEMATJTAGICE2 - AVR ON-CHIP D-BUG SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2545E–AVR–02/05
14 Timer/Counter0 and Timer/Counter1 Prescalers .............................. 135
15 8-bit Timer/Counter2 with PWM and Asynchronous Operation ...... 138
16 Serial Peripheral Interface – SPI ......................................................... 159
17 USART0 ................................................................................................. 168
13.1Overview .............................................................................................................106
13.2Accessing 16-bit Registers ..................................................................................108
13.3Timer/Counter Clock Sources .............................................................................111
13.4Counter Unit ........................................................................................................112
13.5Input Capture Unit ...............................................................................................113
13.6Output Compare Units .........................................................................................115
13.7Compare Match Output Unit ................................................................................117
13.8Modes of Operation .............................................................................................118
13.9Timer/Counter Timing Diagrams .........................................................................125
13.1016-bit Timer/Counter Register Description ........................................................128
15.1Overview .............................................................................................................138
15.2Timer/Counter Clock Sources .............................................................................139
15.3Counter Unit ........................................................................................................139
15.4Output Compare Unit ..........................................................................................140
15.5Compare Match Output Unit ................................................................................142
15.6Modes of Operation .............................................................................................143
15.7Timer/Counter Timing Diagrams .........................................................................147
15.88-bit Timer/Counter Register Description ............................................................149
15.9Asynchronous operation of the Timer/Counter ....................................................155
15.10Timer/Counter Prescaler ...................................................................................158
16.1SS Pin Functionality ............................................................................................164
16.2Data Modes .........................................................................................................166
17.1Overview .............................................................................................................168
17.2Clock Generation .................................................................................................169
17.3Frame Formats ....................................................................................................172
17.4USART Initialization ............................................................................................174
17.5Data Transmission – The USART Transmitter ....................................................176
17.6Data Reception – The USART Receiver .............................................................178
17.7Asynchronous Data Reception ............................................................................182
17.8Multi-processor Communication Mode ................................................................185
17.9USART Register Description ...............................................................................187
iii