MC81F4332 Datasheet, PDF (55/198 Pages) Finechips – ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

9.3 Data Memory
0300H
MC81F4432
0000H
00AFH
00B0H
00FFH
0100H
01FFH
0200H
02FFH
0300H
03FFH
0400H
044FH
User Memory
(176Bytes)
Control Register
(80Bytes)
User Memory
or Stack Area
(256Bytes)
User Memory
(256Bytes)
User Memory
(256Bytes)
User Memory
(80Bytes)
Page 0
(When “G-flag = 0”,
this page 0 is selected
Page 1
Page 2
Page 3
Page 4
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
RPR
7
6
5
4
3
2
1
0
-
RPR bits
R/W R/W R/W R/W R/W R/W R/W R/W
Reset value:
----_--00b
RPR bits Ram Page Select bits
000: page 0
001: page 1
010: page 2
011: page 3
100: page 4
Note :
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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