參數(shù)資料
型號: M34571G4
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述: 單芯片4位微機(jī)的CMOS
文件頁數(shù): 16/126頁
文件大小: 1627K
代理商: M34571G4
Rev.1.02
REJ03B0179-0102
May 25, 2007
Page 16 of 124
4571 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 9 shows the RAM size. Figure 18 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 18. RAM map
Table 9
RAM size and pages
Part number
M34571G4
M34571G6
M34571GD
RAM size
128 words
×
4 bits (512 bits)
Register Z
Register X
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
3
0
1
2
...
6
7
RAM 128 words
×
4 bits (512 bits)
128 words
×
4 bits (512 bits)
M34571G4
M34571G6
M34571GD
Z=0
X=0 to 7
Y=0 to 15
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