ATMEGA325P-20MU Atmel, ATMEGA325P-20MU Datasheet - Page 360

• Manufacturer Part Number: ATMEGA325P-20MU
• Description: IC MCU AVR 32K FLASH 64-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA325P-20MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• Processor Series: ATMEGA32x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: SPI, UART, USI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 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, 8 Channel
• For Use With: ATSTK600-TQFP64 - STK600 SOCKET/ADAPTER 64-TQFP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATMEGA325P-16MU; ATMEGA325P-16MU

iv
ATmega325P/3250P
17 SPI – Serial Peripheral Interface ......................................................... 154
18 USART0 ................................................................................................. 163
19 USI – Universal Serial Interface .......................................................... 191
20 Analog Comparator ............................................................................. 203
21 Analog to Digital Converter ................................................................ 206
16.9Asynchronous Operation of Timer/Counter2 .......................................................147
16.10Register Description ..........................................................................................149
17.1Features ..............................................................................................................154
17.2Overview .............................................................................................................154
17.3SS Pin Functionality ............................................................................................159
17.4Data Modes .........................................................................................................159
17.5Register Description ............................................................................................160
18.1Features ..............................................................................................................163
18.2Overview .............................................................................................................163
18.3Clock Generation .................................................................................................165
18.4Frame Formats ....................................................................................................168
18.5USART Initialization ............................................................................................169
18.6Data Transmission – The USART Transmitter ....................................................171
18.7Data Reception – The USART Receiver .............................................................173
18.8Asynchronous Data Reception ............................................................................177
18.9Multi-processor Communication Mode ................................................................180
18.10Register Description ..........................................................................................182
18.11Examples of Baud Rate Setting ........................................................................186
19.1Features ..............................................................................................................191
19.2Overview .............................................................................................................191
19.3Functional Descriptions .......................................................................................192
19.4Alternative USI Usage .........................................................................................198
19.5Register Descriptions ..........................................................................................199
20.1Overview .............................................................................................................203
20.2Analog Comparator Multiplexed Input .................................................................203
20.3Register Description ............................................................................................204
21.1Features ..............................................................................................................206
21.2Overview .............................................................................................................206
21.3Operation .............................................................................................................207
8023F–AVR–07/09