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ATMEGA640 Datasheet(PDF) 115 Page - ATMEL Corporation

Part # ATMEGA640
Description  8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
PDF  449 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA640 Datasheet(HTML) 115 Page - ATMEL Corporation

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115
ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
Register Description for I/O-Ports
MCUCR – MCU Control
Register
• Bit 4 – PUD: Pull-up Disable
When this bit is written to one, the I/O ports pull-up resistors are disabled even if the
DDxn and PORTxn Registers are configured to enable the pull-up resistor ({DDxn,
PORTxn} = 0b01). See “Configuring the Pin” on page 84 for more details about this
feature.
PORTA – Port A Data Register
DDRA – Port A Data Direction
Register
PINA – Port A Input Pins
Address
PORTB – Port B Data Register
DDRB – Port B Data Direction
Register
PINB – Port B Input Pins
Address
Bit
7
6
5
4
3
2
1
0
0x35 (0x55)
JTD
–
–PUD
–
–
IVSEL
IVCE
MCUCR
Read/Write
R/W
RR
R/W
RR
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Bit
76543210
0x02 (0x22)
PORTA7
PORTA6
PORTA5
PORTA4
PORTA3
PORTA2
PORTA1
PORTA0
PORTA
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
00000000
Bit
76543210
0x01 (0x21)
DDA7
DDA6
DDA5
DDA4
DDA3
DDA2
DDA1
DDA0
DDRA
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
00000000
Bit
76543210
0x00 (0x20)
PINA7
PINA6
PINA5
PINA4
PINA3
PINA2
PINA1
PINA0
PINA
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Bit
76543210
0x05 (0x25)
PORTB7
PORTB6
PORTB5
PORTB4
PORTB3
PORTB2
PORTB1
PORTB0
PORTB
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
00000000
Bit
76543210
0x04 (0x24)
DDB7
DDB6
DDB5
DDB4
DDB3
DDB2
DDB1
DDB0
DDRB
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
00000000
Bit
76543210
0x03 (0x23)
PINB7
PINB6
PINB5
PINB4
PINB3
PINB2
PINB1
PINB0
PINB
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A



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