Texas Instruments MSC1210 manual Port 1 P1, Port 2 P2

Bit Addressable SFRs (alphabetical)

Port 1 (P1)

			SFR Name:		P1
			SFR Address:		90H
			Bit−Addressable: Yes
			Bit−Definitions:
		bit 7		bit 6	bit 5	bit 4	bit 3	bit 2	bit 1	bit 0
	Name	P1.7		P1.6	P1.5	P1.4	P1.3	P1.2	T2EX	T2
	Bit Address	97H		96H	95H	94H	93H	92H	91H	90H
			T2EX—Timer		2 Capture/Reload. Optional external capturing or reloading of
			timer 2.
			T2—Timer 2 External Input. Optionally used to control timer/counter 2 via
			external source.
Port 2 (P2)
			SFR Name:		P2
			SFR Address:		A0H
			Bit−Addressable: Yes
			Bit−Definitions:
		bit 7		bit 6	bit 5	bit 4	bit 3	bit 2	bit 1	bit 0
	Name	A15		A14	A13	A12	A11	A10	A9	A8
	Bit Address	A7H		A6H	A5H	A4H	A3H	A2H	A1H	A0H

Note:

These bit names indicate the function of that I/O line on the P2 bus when used with external memory (code/RAM). A standard 8052 assembler will not recognize these bits by the given names; they will only be recognized as P2.7, P2.6, etc.

Note:

Port 2 is only available for general input/output if the project does not use ex- ternal code memory or external RAM. When such external memory is used, Port 2 is used automatically by the microcontroller to address the memory and read/write data from/to said memory.

Bit-Addressable SFRs (alphabetical) F-5