Intel 8XC196MH, 8XC196MD, 8XC196MC manual Write Strobe Mode

INTERFACING WITH EXTERNAL MEMORY

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

Valid

Valid

Address Data Out

16-bit Bus Cycle

ALE

WRL# and WRH#

AD7:0	Address Low	Data Out
AD15:8	Address High
	8-bit Bus Cycle

A3089-01

Figure 15-14. Write Strobe Mode

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