參數(shù)資料
型號(hào): MC80C52CXXX-20/883D
廠商: TEMIC SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40
文件頁數(shù): 21/60頁
文件大小: 5137K
代理商: MC80C52CXXX-20/883D
28
8266D-MCU Wireless-06/12
ATmega128RFA1
The three General Purpose I/O Registers can be used for storing any information.
Bit 7:0 – GPIOR27:20 - General Purpose I/O Register 2 Value
8.7 Other Port Registers
The inherited control registers of missing ports located in the I/O space are kept in the
ATmega128RFA1. They can be used as general purpose I/O registers for storing any
information. Registers placed in the address range 0x00 – 0x1F are directly bit-
accessible using the SBI, CBI, SBIS and SBIC instructions.
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
Initial Value
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
Initial Value
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
Initial Value
0
The PINA register is reserved for internal use and cannot be used as a General
Purpose I/O Register.
Bit 7:0 – PINA7:0 - Port A Input Pins
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