ABOV SEMICONDUCTOR MC81F4204 - 9.3 Data Memory Structure; 9.4 User Memory and RPR Register

MC81F4204
April 24, 2012 Ver.1.41 51
9.3 Data Memory
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 MC81F4204 has a 192 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
bit
R/W R/W R/W R/W R/W R/W R/W R/W
Reset value:
----_---0b
0: page 0
RPR bit
Ram Page Select bit
1: page 1
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.
Figure 9-8 Data Memory Map