M34512M2 Datasheet, PDF (12/80 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
4512 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
DATA MEMORY (RAM)
1 word of RAM is composed of 4 bits, but 1-bit manipulation (with
the SB j, RB j, and SZB j instructions) is enabled for the entire
memory area. A RAM address is specified by a data pointer. The
data pointer consists of registers Z, X, and Y. Set a value to the
data pointer certainly when executing an instruction to access
RAM.
Table 2 shows the RAM size. Figure 12 shows the RAM map.
Table 2 RAM size
Product
M34512M2
M34512M4
RAM size
128 words ! 4 bits (512 bits)
256 words ! 4 bits (1024 bits)
RAM 256 words ! 4 bits (1024 bits)
Register Z
0
Register X 0 ₁ 2 3 ••• 6 7 ••••• 15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
M34512M4 Z=0, X=0 to 15
M34512M2 Z=0, X=0 to 7
Fig. 12 RAM map
256 words
128 words
12