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8266A-MCU Wireless-12/09
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
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