R8C/20 Group, R8C/21 Group 4. Special Function Registers (SFRs)
Rev.2.00 Aug 27, 2008 Page 15 of 458
REJ09B0250-0200
4. Special Function Registers (SFRs)
An SFR (special function register) is a control register for a peripheral function.
Table 4.1 to Table 4.6 list the SFR Information.
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. The LVD0ON bit in the OFS register is set to 1.
4. Power-on reset, voltage monitor 1 reset or the LVD0ON bit in the OFS register is set to 0.
5. Software reset, watchdog timer reset, and voltage monitor 2 reset do not affect b2 and b3.
6. Software reset, watchdog timer reset, and voltage monitor 2 reset do not affect b7.
7. Software reset, the watchdog timer rest, and the voltage monitor 2 reset do not affect other than the b0 and b6.
8. The CSPROINI bit in the OFS register is 0.
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
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 00h
0013h Address Match Interrupt Enable Register AIER 00h
0014h Address Match Interrupt Register 1 RMAD1 00h
0015h 00h
0016h 00h
0017h
0018h
0019h
001Ah
001Bh
001Ch Count Source Protect Mode Register CSPR 00h
10000000b
(8)
001Dh
001Eh
001Fh
0020h
0021h
0022h
0023h High-Speed On-Chip Oscillator Control Register 0 FRA0 00h
0024h High-Speed On-Chip Oscillator Control Register 1 FRA1 When shipping
0025h High-Speed On-Chip Oscillator Control Register 2 FRA2 00h
0026h
0030h
0031h
Voltage Detection Register 1
(2)
VCA1 00001000b
0032h
Voltage Detection Register 2
(6)
VCA2
00h
(3)
01000000b
(4)
0033h
0034h
0035h
0036h
Voltage Monitor 1 Circuit Control Register
(7)
VW1C
0000X000b
(3)
0100X001b
(4)
0037h
Voltage Monitor 2 Circuit Control Register
(5)
VW2C 00h
0038h
0039h
003Fh
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