參數資料
型號: M34551E8-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, MICROCONTROLLER, PQFP48
封裝: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數: 73/154頁
文件大?。?/td> 1778K
代理商: M34551E8-XXXFP
FUNCTIONAL BLOCK OPERATIONS
HARDWARE
1-14
4551 Group User’s Manual
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, be sure to set a value to the data pointer
certainly when returning from power down.
RAM includes the area corresponding to the LCD. A segment is
turned on automatically when “1” is written in the bit
corresponding to the segment.
Table 2 shows the RAM size. Figure 12 shows the RAM map.
Table 2 RAM size
Product
M34551M4
M34551M8
M34551E8
RAM size
280 words ! 4 bits (1120 bits)
Register
Y
Register Z
Register X
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
0 1
7
RAM 280 words ! 4 bits (1120 bits)
23
615
280 words
01
2
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
The area marked “–” (Z = 1, X = 0 to 2, Y = 0 to 7) is not a memory area.
The numbers in the shaded area indicate the corresponding segment output pin numbers.
Notes 1:
2:
Fig. 12 RAM map
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