13/20

¡ Semiconductor

MSM80C48/49/50, MSM80C35/39/40

Write (to external memory)

Low-order 4 bits input/output of port 2 when expanded I/O port is used

(in external program memory access mode)

FLOAT-

ING

DATA

ADDRESS

ALE

BUS

WR

ADDRESS

PCH

PORT DATA

PORT CONTROL

OUTPUT DATA

PCH

PORT DATA

PORT CONTROL

INPUT

DATA

ALE

PROG

(Output mode)

(Input mode)