参数资料
型号: M34518E8SP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDIP32
封装: 8.90 X 28 MM, 1.78 MM PITCH, PLASTIC, SDIP-32
文件页数: 78/162页
文件大小: 1149K
代理商: M34518E8SP
Rev.3.01
2005.06.15
page 20 of 157
REJ03B0008-0301
4518 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 (also, set a value after system returns from RAM back-up).
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
M34518M2/M4
M34518M6/M8/E8
RAM size
256 words 4 bits (1024 bits)
384 words 4 bits (1536 bits)
M34518M6
M34518M8/E8
M34518M2/M4
Z=0, X=0 to 15
Z=1, X=0 to 7
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
...
7
1
23
6
567
0
15
... ...
384 words
256 words
Register
Y
Register Z
Register X
RAM 384 words 4 bits (1536 bits)
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