w78e54 Winbond Electronics Corp America, w78e54 Datasheet - Page 16

• Manufacturer Part Number: w78e54
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

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
Note: Flash data can be accessed only in flash mode. The RST pin must pull in V
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
V
Data Setup Time
Data Hold Time
Address Setup Time
Address Hold Time
Program Operation
Program Operation
OECTRL Setup Time
OECTRL Hold Time
Data Valid from OE
ALE, since it provides a convenient reference.
CE Program Pulse Width for
CE Program Pulse Width for
OE Setup Time
OE High to Output Float
PP
the PSEN pin must pull in V
Setup Time
PARAMETER
PARAMETER
PARAMETER
IH
status.
SYMBOL
SYMBOL
SYMBOL
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
OPWP
T
T
T
T
PWP
OCH
DAW
DWD
DWR
OCS
OES
OEV
PDS
PDH
PDA
VPS
DFP
DAD
DH
DS
AS
AH
- 16 -
3 T
1 T
1 T
6 T
1 T
1 T
MIN.
MIN.
MIN.
295
295
2.0
2.0
2.0
2.0
2.0
2.0
2.0
CP
CP
CP
CP
0
0
0
-
CP
CP
-
-
-
-
IH
status, the ALE pin must pull in V
6 T
TYP.
TYP.
TYP.
300
300
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
CP
3 T
MAX.
MAX.
MAX.
305
305
130
150
CP
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+
W78E54
IL
UNIT
status, and
UNIT
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
nS
S
S
S
S
S
S
S
S
S
S