W78L801 Datasheet, PDF (15/20 Pages) Winbond – 8-BIT MICROCONTROLLER

W78L801
Port Access Cycle
PARAMETER
Port Input Setup to ALE Low
Port Input Hold from ALE Low
Port Output to ALE
SYMBOL
TPDS
TPDH
TPDA
MIN.
1 TCP
0
1 TCP
TYP.
-
-
-
MAX.
-
-
-
UNIT
nS
nS
nS
Note: Ports are read during S5P2, and output data becomes available at the end of S6P2. The timing data are referenced to
ALE, since it provides a convenient reference.
TIMING WAVEFORMS
Program Fetch Cycle
XTAL1
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
ALE
PSEN
PORT 2
T_APL
T_PSW
T_AAS
T_AAH
T_PDA
PORT 0
Code
A0-A7
Data
T_ALW
T_PDH, T_PDZ
A0-A7 Code
A0-A7
Data A0-A7
Data Read Cycle
XTAL1
ALE
PSEN
PORT 2
PORT 0
RD
S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3
A0-A7
T DAR
A8-A15
T DDA
DATA
T DDH, T DDZ
T DRD
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Publication Release Date: February 1999
Revision A3