4501 查看數據表（PDF） - MITSUBISHI ELECTRIC

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4501

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4501 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

M34501M2

M34501M4

M34501E4

RAM size

128 words ✕ 4 bits (512 bits)

256 words ✕ 4 bits (1024 bits)

256 words ✕ 4 bits (1024 bits)

• Note

Register Z of data pointer is undefined after system is released

from reset.

Also, registers Z, X and Y are undefined in the RAM back-up. After

system is returned from the RAM back-up, set these registers.

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

Z=0, X=0 to 15

256 words (1024 bits) M34501M4/E4

Z=0, X=0 to 7

128 words (512 bits) M34501M2

Fig. 12 RAM map

16

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