ATMEGA328P-20PU Atmel, ATMEGA328P-20PU Datasheet - Page 415

• Manufacturer Part Number: ATMEGA328P-20PU
• Manufacturer: Atmel

Specifications of ATMEGA328P-20PU

• Cpu Family: ATmega
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 20MHz
• Interface Type: SPI/TWI/USART
• Program Memory Type: Flash
• Program Memory Size: 32KB
• Total Internal Ram Size: 2KB
• # I/os (max): 23
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 6-chx10-bit
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 28
• Package Type: PDIP
• Lead Free Status / Rohs Status: Compliant

8025K–AVR–10/09
18 SPI – Serial Peripheral Interface ......................................................... 163
19 USART0 ................................................................................................. 173
20 USART in SPI Mode ............................................................................. 201
17.3Timer/Counter Clock Sources .............................................................................142
17.4Counter Unit ........................................................................................................142
17.5Output Compare Unit ..........................................................................................143
17.6Compare Match Output Unit ................................................................................145
17.7Modes of Operation .............................................................................................146
17.8Timer/Counter Timing Diagrams .........................................................................150
17.9Asynchronous Operation of Timer/Counter2 .......................................................152
17.10Timer/Counter Prescaler ...................................................................................153
17.11Register Description ..........................................................................................155
18.1Features ..............................................................................................................163
18.2Overview .............................................................................................................163
18.3SS Pin Functionality ............................................................................................168
18.4Data Modes .........................................................................................................168
18.5Register Description ............................................................................................170
19.1Features ..............................................................................................................173
19.2Overview .............................................................................................................173
19.3Clock Generation .................................................................................................174
19.4Frame Formats ....................................................................................................177
19.5USART Initialization ............................................................................................179
19.6Data Transmission – The USART Transmitter ....................................................180
19.7Data Reception – The USART Receiver .............................................................183
19.8Asynchronous Data Reception ............................................................................187
19.9Multi-processor Communication Mode ................................................................190
19.10Register Description ..........................................................................................192
19.11Examples of Baud Rate Setting ........................................................................196
20.1Features ..............................................................................................................201
20.2Overview .............................................................................................................201
20.3Clock Generation .................................................................................................201
20.4SPI Data Modes and Timing ...............................................................................202
20.5Frame Formats ....................................................................................................203
20.6Data Transfer ......................................................................................................205
20.7AVR USART MSPIM vs. AVR SPI ......................................................................207
ATmega48P/88P/168P
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