w78e051c Winbond Electronics Corp America, w78e051c Datasheet - Page 15

• Manufacturer Part Number: w78e051c
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

7.3.3 Data Read Cycle
Notes:
7.3.4 Data Write Cycle
Note: " Δ " (due to buffer driving delay and wire loading) is 20 nS.
7.3.5 Port Access Cycle
Note : Ports are read during S5P2, and output data becomes available at the end of S6P2. The timing data are referenced to
ALE Low to RD Low
Data Hold from RD High
Data Float from RD High
Port Input Setup to ALE Low
Port Input Hold from ALE Low
Port Output to ALE
RD Low to Data Valid
RD Pulse Width
ALE Low to WR Low
Data Valid to WR Low
Data Hold from WR High
WR Pulse Width
1. Data memory access time is 8 T
2. " Δ " (due to buffer driving delay and wire loading) is 20 nS.
ALE, since it provides a convenient reference.
PARAMETER
PARAMETER
PARAMETER
CP
SYMBOL
.
T
T
T
T
T
DAR
DDA
DDH
DRD
DDZ
SYMBOL
T
T
T
T
DAW
DWD
DWR
DAD
SYMBOL
3 T
6 T
T
T
T
MIN.
PDH
PDS
PDA
CP
CP
0
0
-
- 15 -
-Δ
-Δ
3 T
1 T
1 T
6 T
MIN.
6 T
TYP.
CP
CP
CP
CP
Publication Release Date: November 10, 2006
-
-
-
-
1 T
1 T
MIN.
CP
-Δ
-Δ
-Δ
-Δ
W78E51C/W78E051C
0
CP
CP
3 T
6 T
TYP.
4 T
2 T
2 T
MAX.
-
-
-
CP
CP
-
TYP.
CP
CP
CP
+Δ
-
-
-
3 T
MAX.
UNIT
CP
MAX.
nS
nS
nS
nS
nS
-
-
-
-
-
-
+Δ
Revision A4
NOTES
UNIT
1, 2
UNIT
nS
nS
nS
1
2
nS
nS
nS
nS