User guide

W78C801
- 16 -
Timing Waveforms, continued
Data Write Cycle
S2 S3S5 S6 S1S2 S3 S4S1S5 S6S4
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
PDHPDS