Rainbow Electronics W78C51D - Manual (Page 13)

Preliminary W78C51D
Publication Release Date: January 1999
- 13 - Revision A1
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 Data Code
PORT 0
PSEN
PDH, T PDZ
T PDA
T AAH
T AAS
T PSW
T APL
T
ALW
Data Read Cycle
S2 S3 S5 S6 S1 S2 S3 S4 S5 S6 S1 S4
XTAL1
ALE
PSEN
DATA
A8-A15 PORT 2
PORT 0
A0-A7
RD
T DDH, T DDZ
T DDA
T DRD
T DAR