參數(shù)資料
型號: M34552M4-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP48
封裝: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數(shù): 63/147頁
文件大?。?/td> 1091K
代理商: M34552M4-XXXFP
Rev.3.02
Dec 22, 2006
page 20 of 142
REJ03B0023-0302
4552 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 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 power down mode.
After system is returned from the power down mode, set these reg-
isters.
Fig. 12 RAM map
Table 2 RAM size
Part number
M34552M4/M4H
M34552M8/M8H
M34552G8/G8H
RAM size
288 words 4 bits (1152 bits)
Register
Y
Register Z
Register X
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
13
RAM 288 words 4 bits (1152 bits)
23
12
...
15
14
0 1
2
0
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
17
18
19
1
Note: The numbers in the shaded area indicate the corresponding segment output pin numbers.
20
21
22
23
24
25
26
27
28
3
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