W78E54B Datasheet, PDF (16/21 Pages) Winbond – 8-BIT MICROCONTROLLER

W78E54B
Program Operation, continued
PARAMETER
CE Program Pulse Width for
Program Operation
OECTRL Setup Time
OECTRL Hold Time
OE Setup Time
OE High to Output Float
Data Valid from OE
SYMBOL
TPWP
TOCS
TOCH
TOES
TDFP
TOEV
MIN.
290
2.0
2.0
2.0
0
-
TYP.
300
MAX.
310
UNIT
µS
-
-
µS
-
-
µS
-
-
µS
-
130
nS
-
150
nS
Note: Flash data can be accessed only in flash mode. The RST pin must pull in VIH status, the ALE pin must pull in VIL status,
and the PSEN pin must pull in VIH status.
TIMING WAVEFORMS
Program Fetch Cycle
XTAL1
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
ALE
PSEN
PORT 2
T_APL
T_PSW
T_AAS
T_AAH
T_PDA
PORT 0
Code
A0-A7
Data
T_ALW
T_PDH, T_PDZ
A0-A7
Code
A0-A7
Data A0-A7
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