M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 544

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

External Buses
Figure 5.4.9. Chip selects and address bus
5.4.8 Chip Selects and Address Bus
When there are insufficient chip select signals, it is necessary to generate chip selects externally. Figure
5.4.9 shows an example of a connection in which the CS2 area is divided into four 32K byte areas.
0FFFF
1FFFF
2FFFF
FFFFF
17FFF
00000
08000
10000
18000
20000
30000
M16C/62 Group
BYTE
CNV
S
S
16
16
16
16
16
16
16
16
16
16
16
A
D
0
0
Memory map
to A
to D
CS2
WR
RD
17
7
IC0
IC1
IC2
IC3
A
A
A
15
16
17
74HC138
1
2
3
4
5
6
8
16
14
13
12
11
Y1
Y2
Y3
Y4
CS2
A
A
A
A
A
A
A
A
A
A
D
D
D
9
8
7
6
5
4
3
2
1
0
0
1
2
2
3
4
5
6
7
8
9
10
11
12
13
14
1
M5M5278
IC0
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A
A
A
A
Y
A
D
D
D
D
D
10
11
12
13
14
1
7
6
5
4
3
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
.....
A
D
0
0
to A
to D
14
7
M5M5278
Mitsubishi microcomputers
M16C / 62 Group
IC3
Y
4
529