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8XC196MC, MD, MH USER’S MANUAL
15-24
Figure 15-13 shows a system that uses the dynamic bus-width feature. (The CCR bits, BW0 and
BW1, are set.) Code is executed from the two EPROMs and data is stored in the byte-wide RAM.
The RAM is in high memory. It is selected by driving AD15 high, which also selects the 8-bit
bus-width mode by driving the BUSWIDTH signal low.
Figure 15-13. 16-bit System with Dynamic Bus Width
A3087-01
AD15:8
RD#
ALE
74AC
373
74AC
373
A13:7
A6:0
CS#
CS#
OE# OE#
8XC196
16K×8
EPROM
(High)
16K×8
EPROM
(Low)
D7:0
CS#
OE#
8K×8
RAM
WE#
WR#
BUSWIDTH
AD7:0
LE
LE
A13:7
A12:8
A6:0 A7:0
D7:0
D15:8
A7:1
A7:1
A7:0
A14:8
A14:8
A12:8
A15