w78e516b Winbond Electronics Corp America, w78e516b Datasheet - Page 25

• Manufacturer Part Number: w78e516b
• 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
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
Port Input Setup to ALE Low
Port Input Hold from ALE Low
Port Output to ALE
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
SYMBOL
T
T
T
T
T
T
T
DAW
DWD
DWR
DAD
PDH
PDS
PDA
- 25 -
3 T
6 T
MIN.
CP
CP
0
0
-
3 T
1 T
1 T
6 T
-Δ
-Δ
1 TCP
1 TCP
MIN.
MIN.
CP
CP
CP
CP
0
-Δ
-Δ
-Δ
-Δ
6 T
TYP.
-
-
-
-
Publication Release Date: April 22, 2008
CP
6 T
TYP.
TYP.
3 T
-
-
-
-
-
-
CP
4 T
2 T
2 T
MAX.
CP+
-
CP
CP
CP
Δ
3 T
MAX.
MAX.
W78E516B
CP
-
-
-
UNIT
-
-
-
nS
nS
nS
nS
nS
+Δ
Revision A12
NOTES
UNIT
UNIT
nS
nS
nS
nS
1, 2
nS
nS
nS
1
2