W78C32C Datasheet, PDF (10/18 Pages) Winbond – 8-BIT MICROCONTROLLER

W78C32C/W78C032C
6.3.2 Program Fetch Cycle
PARAMETER
Address Valid to ALE Low
Address Hold after ALE Low
ALE Low to PSEN Low
PSEN Low to Data Valid
Data Hold after PSEN High
Data Float after PSEN High
ALE Pulse Width
PSEN Pulse Width
SYMBOL
TAAS
TAAH
TAPL
TPDA
TPDH
TPDZ
TALW
TPSW
MIN.
1 TCP-∆
1 TCP-∆
1 TCP-∆
-
0
0
2 TCP-∆
3 TCP-∆
TYP.
-
-
-
-
-
-
2 TCP
3 TCP
Notes:
1. P0.0−P0.7, P2.0−P2.7 remain stable throughout entire memory cycle.
2. Memory access time is 3 TCP.
3. Data have been latched internally prior to PSEN going high.
4. "∆" ( due to buffer driving delay and wire loading) is 20 nS.
MAX.
-
-
-
2 TCP
1 TCP
1 TCP
-
-
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
NOTES
4
1, 4
4
2
3
4
4
6.3.3 Data Read Cycle
PARAMETER
ALE Low to RD Low
RD Low to Data Valid
Data Hold after RD High
Data Float after RD High
RD Pulse Width
SYMBOL
TDAR
TDDA
TDDH
TDDZ
TDRD
MIN.
3 TCP-∆
-
0
0
6 TCP-∆
Notes:
1. Data memory access time is 8 TCP.
2. "∆" (due to buffer driving delay and wire loading) is 20 nS.
TYP.
-
-
-
-
6 TCP
MAX.
3 TCP+∆
4 TCP
2 TCP
2 TCP
-
UNIT
nS
nS
nS
nS
nS
NOTES
1, 2
1
2
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