Intel mcs-48 manual P20-P23 -- .....--X..... ...Jr

8243

EXPANDER INTERFACE

-=-

	I/O	cs
			P'		I/O
		PROG
	TEST		P5		I/O
8048	INPUTS	8243
			P6		I/O
P20-P23		DATA IN
		P2	P7		I/O
	OUTPUT EXPANDER TIMING
			BITS 3,2		BITS 1,0
			OO} REAO		OO~
P20-P23--(....._--'X.....___...J)r---			01	WRITE	O1J PORT
			10	OR	Hl ADDRESS
			11_	AND	"
ADDRESS 14-BITS)	DATA (4-8IT8)

BUS

PORT 1

804B

PORT 2

PROG.----------------- ~------------------ +_---------------- ~~________________~

USING MULTIPLE 8243'5

6-62 AFN-oQ214A-08