8-Bit Memory To 16-Bit Width Data Bus Connection Example - Renesas M16C Series User Manual

M30245 Group

4.3.2 8-bit Memory to 16-bit Width Data Bus Connection Example

Figure 4.3.2 shows an example of connecting two M5M5278's (SRAM) to a 16-bit data bus.In this dia-
gram, when reset the microcomputer starts operating in single-chip mode. Change this mode to memory
expansion mode in a program.
Microcomputer
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C N V
B Y T E
Figure 4.3.2. Example of connecting two M5M5278's to a 16-bit data bus
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
W R H
S S
W R L
D to D
0 15
C S 0
C S 0
R D
R D
A
t o
A
A to A
1 15
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WRL
S
W
D
0
OE DQ
1
t o
t o
D
7
DQ
1 5
8
A
14
to
1
A
0
M5M5278D
4. External Buses
C S 0
W R H
S
W
RD
D
8
OE D Q
1
t o
t o
A
15
D
A 1 5
1 4
D Q
8
to
to
A
1
A
0
M5M5278D