MC81F4432
9.3 Data Memory
0000H
User Memory
(176Bytes)
Page 0
(When “G-flag = 0”,
this page 0 is selected
00AFH
00B0H
Control Register
(80Bytes)
00FFH
0100H
User Memory
or Stack Area
(256Bytes)
Page 1
Page 2
Page 3
Page 4
01FFH
0200H
User Memory
(256Bytes)
0300H
02FFH
0300H
User Memory
(256Bytes)
03FFH
0400H
User Memory
(80Bytes)
044FH
Figure 9-8 Data Memory Map
Figure 9-8 shows the internal Data Memory space available. Data Memory is divided into three groups,
a user RAM, Stack memory and Control registers.
9.4 User Memory
The MC81F4x32 has a 512 bytes user memory (RAM). RAM pages are selected by the RPR register.
RPR
RAM PAGE SELECT REGISTER
00E1H
7
6
5
4
3
2
1
0
RPR
RPR bits
Note :
-
RPR bits
Reset value:
----_--00b
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
000: page 0
001: page 1
010: page 2
011: page 3
100: page 4
Ram Page Select bits
After setting RPR(RAM Page Select Register), be sure to execute SETG instruction.
Whenever CLRG instruction is excuted, PAGE0 is selected regardless of RPR.
October 19, 2009 Ver.1.35
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