W78C438C Datasheet, PDF (13/16 Pages) Winbond – 8-BIT MICROCONTROLLER

W78C438C
TIMING WAVEFORMS
Program Fetch Cycle
XTAL1
S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
PSEN
AP6<7:0>
AP5<7:0>
DP4<7:0>
T_APL
address
T_PDV
address code
Data Memory Read/Write Cycle
S4 S5 S6 S7 S8 S9 S10 S11 S12 S1 S2 S3
XTAL1
PSEN
AP7<3:0>
addr <19:16> out
(When bit7 of EPMA is 0.)
AP6<7:0>
AP5<7:0>
DPH or HB SFR out
DPL or Ri out
PGM address
PGM address
RD
DP4<7:0>
WR
DP4<7:0>
T_ARL
addr.
T_AWL
addr.
T_DWL
T_RS
T_RDV
TWS
T_RDQ
data
addr.
DATA OUT
TWDQ
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Publication Release Date: July 1998
Revision A1