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4559 Datasheet(PDF) 22 Page - Renesas Technology Corp

Part # 4559
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  148 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4559 Datasheet(HTML) 22 Page - Renesas Technology Corp

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Rev.1.04
Aug 23, 2007
Page 22 of 146
REJ03B0188-0104
4559 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 power
down mode).
RAM includes the area for LCD.
When writing “1” to a bit corresponding to displayed segment,
the segment is turned on.
Table 9 shows the RAM size. Figure 23 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 power down mode.
After system is returned from the power down mode, set these
registers.
Fig 23. RAM map
Table 9
RAM size and pages
Part number
RAM size
M34559G6
288 words
× 4 bits (1152 bits)
Register Z
Register X
0
0
1
2
3
12
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
RAM 288 words
× 4 bits (1152 bits)
13 14 15
0
1
2
3
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Note: The numbers in the shaded area indicate the corresponding segment output pin numbers.
...



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