MC81F4216 Datasheet, PDF (59/200 Pages) Finechips – ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

9.3 Data Memory
0300H
0000H
00AFH
00B0H
00FFH
0100H
01FFH
0200H
024FH
User Memory
(176Bytes)
Control Register
(80Bytes)
User Memory
or Stack Area
(256Bytes)
User Memory
(80Bytes)
MC81F4x16
Page 0
(When “G-flag = 0”,
this page 0 is selected
Page 1
Page 2
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 MC81F4x16 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
00: page 0
01: page 1
10: page 2
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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