W78958B Datasheet, PDF (23/28 Pages) Winbond – 8-BIT EMULATION MICROCONTROLLER

Emulation Mode Cycle (Internal SFR/PC/RAM Access)
W78958B
XTAL1
ALE
PSEN
ICESET
EMU
AP6<7:0>
AP5<7:0>
DP4<7:0>
AP7<1> (ERD)
AP6<0>
AP5<7:0>
DP4<7:0>
AP7<0> (EWR)
AP6<0>
AP5<7:0>
DP4<7:0>
S4 S5 S6 S1 S2 S2 S2
S2 S2 S3 S4
T_IE
T_AIS
R
T_AUH
address
address code
high impedance
address input
T_EARL
T_ERS
T_ERAQ
read data
T_ERDV
T_ERDQ
address input
T_EAWL
T_EWS
T_EWAQ
write data
T_EDWL
T_EWDQ
T_IUL
first valid address starts here
after leaving emulation mode
for the second
(ignored) byte of NOP
- 23 -
Publication Release Date: September 1997
Revision A3