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4502 датащи(PDF) 29 Page - Renesas Technology Corp

номер детали 4502
подробное описание детали  4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES
PDF  214 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4502 датащи(HTML) 29 Page - Renesas Technology Corp

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1-17
4502 Group
HARDWARE
Rev.2.01
Feb 02, 2005
REJ09B0193-0201
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
M34502M2
M34502M4
M34502E4
RAM size
128 words ✕ 4 bits (512 bits)
256 words ✕ 4 bits (1024 bits)
256 words ✕ 4 bits (1024 bits)
Z=0, X=0 to 15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
0
1
7
23
6
...
15
........
Z=0, X=0 to 7
Register Z
Register X
RAM 256 words ✕ 4 bits (1024 bits)
256 words (1024 bits) M34502M4/E4
128 words (512 bits) M34502M2
FUNCTION BLOCK OPERATIONS



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