Preliminary W78LE516
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TIMING WAVEFORMS
Program Fetch Cycle
S1
XTAL1
S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
ALE
PORT 2
A0-A7
A0-A7
Data
A0-A7
Code
T
A0-A7
DataCode
PORT 0
PSEN
PDH,
T
PDZ
T
PDA
T
AAH
T
AAS
T
PSW
T
APL
T
ALW
Data Read Cycle
S2 S3S5 S6 S1S2 S3 S4S5 S6 S1S4
XTAL1
ALE
PSEN
DATA
A8-A15
PORT 2
PORT 0
A0-A7
RD
T
DDH,
T
DDZ
T
DDA
T
DRD
T
DAR
