R8C/1A Group, R8C/1B Group 4. Special Function Registers (SFRs)
Rev.1.30 Dec 08, 2006 Page 20 of 315
REJ09B0252-0130
4. Special Function Registers (SFRs)
An SFR (special function register) is a control register for a peripheral function. Tables 4.1 to 4.4 list the
special function registers.
Table 4.1 SFR Information (1)
(1)
X: Undefined
NOTES:
1. The blank regions are reserved. Do not access locations in these regions.
2. Software reset, watchdog timer reset, and voltage monitor 2 reset do not affect this register.
3. After hardware reset.
4. After power-on reset or voltage monitor 1 reset.
5. Software reset, watchdog timer reset, and voltage monitor 2 reset do not affect b2 and b3.
Address Register Symbol After reset
0000h
0001h
0002h
0003h
0004h Processor Mode Register 0 PM0 00h
0005h Processor Mode Register 1 PM1 00h
0006h System Clock Control Register 0 CM0 01101000b
0007h System Clock Control Register 1 CM1 00100000b
0008h
0009h Address Match Interrupt Enable Register AIER 00h
000Ah Protect Register PRCR 00h
000Bh
000Ch Oscillation Stop Detection Register OCD 00000100b
000Dh Watchdog Timer Reset Register WDTR XXh
000Eh Watchdog Timer Start Register WDTS XXh
000Fh Watchdog Timer Control Register WDC 00X11111b
0010h Address Match Interrupt Register 0 RMAD0 00h
0011h 00h
0012h X0h
0013h
0014h Address Match Interrupt Register 1 RMAD1 00h
0015h 00h
0016h X0h
0017h
0018h
0019h
001Ah
001Bh
001Ch Count Source Protection Mode Register CSPR 00h
001Dh
001Eh
INT0
Input Filter Select Register
INT0F 00h
001Fh
0020h High-Speed On-Chip Oscillator Control Register 0 HRA0 00h
0021h High-Speed On-Chip Oscillator Control Register 1 HRA1 When shipping
0022h High-Speed On-Chip Oscillator Control Register 2 HRA2 00h
0023h
002Ah
002Bh
002Ch
002Dh
002Eh
002Fh
0030h
0031h
Voltage Detection Register 1
(2)
VCA1 00001000b
0032h
Voltage Detection Register 2
(2)
VCA2
00h
(3)
01000000b
(4)
0033h
0034h
0035h
0036h
Voltage Monitor 1 Circuit Control Register
(2)
VW1C
0000X000b
(3)
0100X001b
(4)
0037h
Voltage Monitor 2 Circuit Control Register
(5)
VW2C 00h
0038h
0039h
003Ah
003Bh
003Ch
003Dh
003Eh
003Fh
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