ATMEGA644A-MU Atmel, ATMEGA644A-MU Datasheet - Page 87
ATMEGA644A-MU
Manufacturer Part Number
ATMEGA644A-MU
Description
IC MCU AVR 64K FLASH 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-MU
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
32
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8272A–AVR–01/10
• TMS/PCINT19 – Port C, Bit 3
TMS, JTAG Test Mode Select.
PCINT19, Pin Change Interrupt source 19: The PC3 pin can serve as an external interrupt
source.
• TCK/PCINT18 – Port C, Bit 2
TCK, JTAG Test Clock.
PCINT18, Pin Change Interrupt source 18: The PC2 pin can serve as an external interrupt
source.
• SDA/PCINT17 – Port C, Bit 1
SDA, 2-wire Serial Bus Data Input/Output Line.
PCINT17, Pin Change Interrupt source 17: The PC1 pin can serve as an external interrupt
source.
• SCL/PCINT16 – Port C, Bit 0
SCL, 2-wire Serial Bus Clock Line.
PCINT16, Pin Change Interrupt source 16: The PC0 pin can serve as an external interrupt
source.
Table 13-10
shown in
Table 13-10. Overriding Signals for Alternate Functions in PC7:PC4
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Signal
Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
Figure 13-5 on page
T/C2 OSC OUTPUT
PC7/TOSC2/
PCINT23
AS2 • EXCLK
0
AS2 • EXCLK
0
0
0
AS2 • EXCLK +
PCINT23 • PCIE2
AS2
PCINT23 INPUT
and
Table 13-11
79.
relate the alternate functions of Port C to the overriding signals
PC6/TOSC1/
PCINT22
AS2
0
AS2
0
0
0
AS2 +
PCINT22 • PCIE2
EXCLK + AS2
PCINT22 INPUT
T/C2 OSC
INPUT
PC5/TDI/
PCINT21
JTAGEN
1
JTAGEN
0
0
0
JTAGEN +
PCINT21 • PCIE2
JTAGEN
PCINT21 INPUT
TDI INPUT
PC4/TDO/
PCINT20
JTAGEN
1
JTAGEN
SHIFT_IR +
SHIFT_DR
JTAGEN
TDO
JTAGEN +
PCINT20 • PCIE2
JTAGEN
PCINT20 INPUT
–
87
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