參數(shù)資料
型號: M34501E4FP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, MICROCONTROLLER, PDSO20
封裝: 5.30 X 12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁數(shù): 26/116頁
文件大?。?/td> 859K
代理商: M34501E4FP
4501 Group
Rev.3.01
2005.02.07
page 17 of 112
REJ03B0104-0301
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
M34501M2
M34501M4
M34501E4
RAM size
128 words 4 bits (512 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
1
7
23
6
...
15
........
Z=0, X=0 to 7
R
e
g
is
te
r
Y
Register Z
Register X
RAM 256 words 4 bits (1024 bits)
256 words (1024 bits) M34501M4/E4
128 words (512 bits) M34501M2
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