W78LE51 Datasheet, PDF (15/21 Pages) Winbond – 8-BIT MTP MICROCONTROLLER

Preliminary W78LE51
Port Access Cycle
PARAMETER
SYMBOL MIN. TYP. MAX. UNIT
Port Input Setup to ALE Low
Port Input Hold from ALE Low
Port Output to ALE
TPDS
1 TCP
-
TPDH
0
-
TPDA
1 TCP
-
-
nS
-
nS
-
nS
Note: Ports are read during S5P2, and output data becomes available at the end of S6P2. The timing data are referenced to
ALE, since it provides a convenient reference.
Program Operation
PARAMETER
SYMBOL MIN. TYP. MAX. UNIT
VPP Setup Time
TVPS
2.0
-
-
µS
Data Setup Time
Data Hold Time
TDS
2.0
-
-
µS
TDH
2.0
-
-
µS
Address Setup Time
TAS
2.0
-
-
µS
Address Hold Time
CE Program Pulse Width for
Program Operation
TAH
TPWP
0
-
-
µS
290
300
310
µS
OECTRL Setup Time
OECTRL Hold Time
TOCS
2.0
-
-
µS
TOCH
2.0
-
-
µS
OE Setup Time
TOES
2.0
-
-
µS
OE High to Output Float
TDFP
0
-
130
nS
Data Valid from OE
TOEV
-
-
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
T_ALW
T_PDH, T_PDZ
PORT 0
Code
A0-A7
Data
A0-A7
Code A0-A7
Data
A0-A7
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Publication Release Date: December 1998
Revision A1