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MSM80C154S/83C154S/85C154HVS
58
BANK 3
BANK 2
BANK 1
BANK 0
USER DATA RAM
USER DATA RAM
7F 7E 7D 7C 7B 7A 79 78
77 76 75 74 73 72 71 70
6F 6E 6D 6C 6B 6A 69 68
67 66 65 64 63 62 61 60
5F 5E 5D 5C 5B 5A 59 58
57 56 55 54 53 52 51 50
4F 4E 4D 4C 4B 4A 49 48
47 46 45 44 43 42 41 40
3F 3E 3D 3C 3B 3A 39 38
37 36 35 34 33 32 31 30
2F 2E 2D 2C 2B 2A 29 28
27 26 25 24 23 22 21 20
1F 1E 1D 1C 1B 1A 19 18
17 16 15 14 13 12 11 10
0F 0E 0D 0C 0B 0A 09 08
07 06 05 04 03 02 01 00
20H
1FH
18H
17H
10H
0FH
08H
07H
00H
21H
22H
23H
24H
25H
26H
27H
28H
29H
2AH
2BH
2CH
2DH
2EH
2FH
30H
7FH
80H
0FFH
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
127
128
255
32
31
24
23
16
15
8
7
0
BIT ADDRESSING
DATA ADDRESSING
REGISTER 0, 1 INDIRECT ADDRESSING
REGISTER 0~7 DIRECT ADDRESSING
Figure 4-2 RAM layout diagram