w78e52b Winbond Electronics Corp America, w78e52b Datasheet - Page 15

• Manufacturer Part Number: w78e52b
• Description: 8-bit Mtp Microcontroller
• Manufacturer: Winbond Electronics Corp America

Data Read Cycle
Notes:
1. Data memory access time is 8 T
2. " " (due to buffer driving delay and wire loading) is 20 nS.
Data Write Cycle
Note: " " (due to buffer driving delay and wire loading) is 20 nS.
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
Program Operation
ALE Low to WR Low
Data Valid to WR Low
Data Hold from WR High
WR Pulse Width
ALE Low to RD Low
RD Low to Data Valid
Data Hold from RD High
Data Float from RD High
RD Pulse Width
Port Input Setup to ALE Low
Port Input Hold from ALE Low
Port Output to ALE
V
Data Setup Time
Data Hold Time
Address Setup Time
Address Hold Time
PP
ALE, since it provides a convenient reference.
Setup Time
PARAMETER
PARAMETER
PARAMETER
PARAMETER
CP
.
SYMBOL
T
T
T
T
T
SYMBOL
DAR
DDA
DDH
DDZ
DRD
T
T
T
T
DWD
DWR
DAW
DAD
SYMBOL
SYMBOL
T
T
T
T
T
T
T
T
PDS
PDH
PDA
VPS
DH
DS
AS
AH
3 T
6 T
MIN.
- 15 -
CP
CP
0
0
-
3 T
1 T
1 T
6 T
MIN.
-
-
CP
CP
CP
CP
1 T
1 T
MIN.
MIN.
2.0
2.0
2.0
2.0
-
-
-
-
0
0
6 T
CP
CP
TYP.
-
-
-
-
CP
6 T
Preliminary W78E52B
TYP.
Publication Release Date: December 1998
-
-
-
CP
TYP.
TYP.
-
-
-
-
-
-
-
-
3 T
MAX.
4 T
2 T
2 T
CP
3 T
-
CP
CP
CP
MAX.
+
MAX.
CP
MAX.
-
-
-
-
-
-
-
-
-
-
-
+
UNIT
nS
nS
nS
nS
nS
UNIT
UNIT
UNIT
nS
nS
nS
nS
nS
nS
nS
S
S
S
S
S
Revision A1
NOTES
1, 2
1
2