参数资料
型号: M34508G4H-XXXFP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO20
封装: 5.30 X12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件页数: 10/32页
文件大小: 1049K
代理商: M34508G4H-XXXFP
Rev.1.03
2009.07.27
page 18 of 140
REJ03B0148-0103
4508 Group
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.
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.
Fig. 12 RAM map
Table 2 RAM size
Part number
M34508G4
M34508G4H
RAM size
256 words 4 bits (1024 bits)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
7
23
6
...
15
........
Register
Y
Register Z
Register X
RAM 256 words 4 bits (1024 bits)
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M34508G4-XXXFP 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO20
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