Rainbow Electronics W78C438C - Manual (Page 13)

W78C438C
Publication Release Date: July 1998
- 13 - Revision A1
TIMING WAVEFORMS
Program Fetch Cycle
S1 S2
XTAL1
PSEN
S3 S4 S5 S6 S1 S2 S3 S4 S5 S6
AP6<7:0>
AP5<7:0>
DP4<7:0>
address
code address
T
APL
T
PDV
Data Memory Read/Write Cycle
S1 S2 S3 S8 S9 S10 S11 S12 S4 S5 S6 S7
XTAL1
PSEN
data addr.
RD
DP4<7:0>
WR
DP4<7:0> DATA OUT addr.
addr.
T
RS
T
ARL
T
RDV
T
RDQ
T
WS
T
DWL T WDQ
T AWL
AP6<7:0>
DPH or HB SFR out PGM address
PGM address DPL or Ri out
AP5<7:0>
AP7<3:0> addr <19:16> out
(When bit7 of EPMA is 0.)