Rainbow Electronics W78C51D - Manual (Page 14)

Preliminary W78C51D
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Timing Waveforms, continued
Data Write Cycle
S2 S3 S5 S6 S1 S2 S3 S4 S1 S5 S6 S4
XTAL1
ALE
PSEN
A8-A15
DATA OUT
PORT 2
PORT 0 A0-A7
WR
T
T DAW
DAD
T DWR
T DWD
Port Access Cycle
XTAL1
ALE
S5 S6 S1
DATA OUT
T T
PORT
INPUT
T
SAMPLE
PDA PDH PDS