Intel Embedded Microcontroller, 8XC251SA, 8XC251SP P0 Contents, P1 Contents, P1.70 Port 1 Register

REGISTERS

P0	Address:	S:80H
	Reset State:	1111 1111B

Port 0. P0 is the SFR that contains data to be driven out from the port 0 pins. Read-modify-write instructions that read port 0 read this register. The other instructions that read port 0 read the port 0 pins. When port 0 is used for an external bus cycle, the CPU always writes FFH to P0, and the former contents of P0 are lost.

7		0
		P0 Contents
Bit	Bit	Function
Number	Mnemonic
7:0	P0.7:0	Port 0 Register:
		Write data to be driven onto the port 0 pins to these bits.

P1	Address:	S:90H
	Reset State:	1111 1111B

Port 1. P1 is the SFR that contains data to be driven out from the port 1 pins. Read-write-modify instructions that read port 1 read this register. Other instructions that read port 1 read the port 1 pins.

7		0
		P1 Contents
Bit	Bit	Function
Number	Mnemonic
7:0	P1.7:0	Port 1 Register:

Write data to be driven onto the port 1 pins to these bits.

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