1 porta - port a data register, 2 ddra - port a data direction register, 3 pina - port a input pins address – Rainbow Electronics ATmega128RFA1 User Manual
Page 27: 4 portc - port c data register, Atmega128rfa1
27
8266A-MCU Wireless-12/09
ATmega128RFA1
8.7.1 PORTA – Port A Data Register
Bit
7
6
5
4
3
2
1
0
$02 ($22)
PORTA7:0
PORTA
Read/Write
RW
RW
RW
RW
RW
RW
RW
RW
Initial Value
0
0
0
0
0
0
0
0
The PORTA register can be used as a General Purpose I/O Register for storing any
information.
•
Bit 7:0 – PORTA7:0 - Port A Data Register Value
8.7.2 DDRA – Port A Data Direction Register
Bit
7
6
5
4
3
2
1
0
$01 ($21)
DDA7
DDA6
DDA5
DDA4
DDA3
DDA2
DDA1
DDA0
DDRA
Read/Write
RW
RW
RW
RW
RW
RW
RW
RW
Initial Value
0
0
0
0
0
0
0
0
The DDRA register can be used as a General Purpose I/O Register for storing any
information.
•
Bit 7:0 – DDA7:0 - Port A Data Direction Register Value
8.7.3 PINA – Port A Input Pins Address
Bit
7
6
5
4
3
2
1
0
$00 ($20)
PINA7:0
PINA
Read/Write
RW
RW
RW
RW
RW
RW
RW
RW
Initial Value
0
0
0
0
0
0
0
0
The PINA register is reserved for interal use and cannot be used as a General Purpose
I/O Register.
•
Bit 7:0 – PINA7:0 - Port A Input Pins
8.7.4 PORTC – Port C Data Register
Bit
7
6
5
4
3
2
1
0
$08 ($28)
PORTC7:0
PORTC
Read/Write
RW
RW
RW
RW
RW
RW
RW
RW
Initial Value
0
0
0
0
0
0
0
0
The PORTC register can be used as a General Purpose I/O Register for storing any
information.
•
Bit 7:0 – PORTC7:0 - Port C Data Register Value