參數(shù)資料
型號(hào): M34524MC-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP64
封裝: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64
文件頁數(shù): 80/163頁
文件大?。?/td> 1235K
代理商: M34524MC-XXXFP
Rev.2.00
Jul 27, 2004
page 21 of 159
REJ03B0091-0200Z
4524 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).
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 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
M34524M8
M34524MC
M34524ED
RAM size
512 words 4 bits (2048 bits)
R
e
g
is
te
r
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 512 words 4 bits (2048 bits)
23
12
...
15
14
1112 13 14 15
0
1
2 ...
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
1
Note: The numbers in the shaded area indicate the corresponding segment output pin numbers.
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