W78C32C Datasheet, PDF (9/14 Pages) Winbond – 8-BIT MICROCONTROLLER

W78C32C
Port Access Cycle
PARAMETER
SYMBOL MIN. TYP. MAX. UNIT
Port Input Setup to ALE Low
TPDS
1 TCP
-
-
nS
Port Input Hold from ALE Low
TPDH
0
-
-
nS
Port Output to ALE
TPDA
1 TCP
-
-
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
TAAS
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
TDAR
A8-A15
T_DDA
DATA
T DDH, T DDZ
T_DRD
Publication Release Date: July 1999
-9-
Revision A2