Write Strobe Mode - Intel 8XC196MC User Manual

15.5.2 Write Strobe Mode

The write strobe mode eliminates the need to externally decode high- and low-byte writes to an
external 16-bit RAM or flash device in 16-bit bus mode. When the write strobe mode is selected,
the microcontroller generates WRL# and WRH# instead of WR# and BHE#. WRL# is asserted
for all low byte writes (even addresses) and all word writes. WRH# is asserted for all high byte
writes (odd addresses) and all word writes. In the 8-bit bus mode, WRH# and WRL# are asserted
for both even and odd addresses. Figure 15-14 shows write strobe mode timing.
ALE
WRL#
WRH#
AD15:0
Address
16-bit Bus Cycle
Valid
WRL# and WRH#
Valid
AD15:8
Data Out
Figure 15-14. Write Strobe Mode
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INTERFACING WITH EXTERNAL MEMORY
ALE
AD7:0
Address Low
Address High
8-bit Bus Cycle
Data Out
A3089-01
15-25