參數(shù)資料
型號: M3455AG8-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP52
封裝: 10 X 10 MM, 0.65 MM PITCH, PLASTIC, LQFP-52
文件頁數(shù): 68/150頁
文件大?。?/td> 1818K
代理商: M3455AG8-XXXFP
Rev.1.02
Nov 26, 2008
Page 22 of 146
REJ03B0224-0102
455A 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
M3455AG8
512 words
× 4 bits (2048 bits)
M3455AGC
Register Z
R
egi
st
er
Y
Register X
0
1
2
3
... 12
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
RAM 512 words
× 4 bits (2048 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.
... 12 131415
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