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4571 Datasheet(PDF) 16 Page - Renesas Technology Corp

Part # 4571
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  126 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4571 Datasheet(HTML) 16 Page - Renesas Technology Corp

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Rev.1.02
May 25, 2007
Page 16 of 124
REJ03B0179-0102
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
RAM size
M34571G4
128 words
× 4 bits (512 bits)
M34571G6
M34571GD
Register Z
Register X
0
0
1
2
3
... 6 7
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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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