ATMEGA644P-A15MZ Atmel, ATMEGA644P-A15MZ Datasheet - Page 373

• Manufacturer Part Number: ATMEGA644P-A15MZ
• Description: MCU AVR 64KB FLASH 16MHZ 44QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7674F–AVR–09/09
20 AC - Analog Comparator ..................................................................... 240
21 ADC - Analog-to-digital Converter ..................................................... 243
22 JTAG Interface and On-chip Debug System ..................................... 263
23 IEEE 1149.1 (JTAG) Boundary-scan ................................................... 269
19.7
19.8
19.9
20.1
20.2
20.3
21.1
21.2
21.3
21.4
21.5
21.6
21.7
21.8
21.9
22.1
22.2
22.3
22.4
22.5
22.6
22.7
22.8
22.9
22.10
23.1
23.2
23.3
23.4
23.5
23.6
Transmission Modes .....................................................................................221
Multi-master Systems and Arbitration ............................................................234
Register Description ......................................................................................235
Overview ........................................................................................................240
Analog Comparator Multiplexed Input ...........................................................240
Register Description ......................................................................................241
Features ........................................................................................................243
Overview ........................................................................................................243
Operation .......................................................................................................244
Starting a Conversion ....................................................................................245
Prescaling and Conversion Timing ................................................................246
Changing Channel or Reference Selection ...................................................249
ADC Noise Canceler .....................................................................................251
ADC Conversion Result .................................................................................256
Register Description ......................................................................................258
Features ........................................................................................................263
Overview ........................................................................................................263
TAP – Test Access Port ................................................................................264
TAP Controller ...............................................................................................265
Using the Boundary-scan Chain ....................................................................266
Using the On-chip Debug System .................................................................266
On-chip Debug Specific JTAG Instructions ...................................................267
Using the JTAG Programming Capabilities ...................................................268
Bibliography ...................................................................................................268
Register Description ......................................................................................268
Features ........................................................................................................269
Overview ........................................................................................................269
Data Registers ...............................................................................................270
Boundary-scan Specific JTAG Instructions ...................................................271
Boundary-scan Chain ....................................................................................272
ATmega164P/324P/644P Boundary-scan Order ..........................................275
ATmega164P/324P/644P
373