¡ Semiconductor
MSM80C48/49/50, MSM80C35/39/40
Write (to external memory)
ALE
tCC
WR
tAW
tDW
tWD
FLOAT-
ING
BUS
ADDRESS
DATA
ADDRESS
Low-order 4 bits input/output of port 2 when expanded I/O port is used
(in external program memory access mode)
ALE
tLP
tPL
tDP
tPD
P20-3
(Output mode)
PCH
PCH
PORT DATA PORT CONTROL
OUTPUT DATA
tPF
tPR
P20-3
(Input mode)
INPUT
DATA
PORT DATA PORT CONTROL
tCP
tPC
tPP
PROG
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