R8C/33T Group 4. Special Function Registers (SFRs)
R01DS0046EJ0110 Rev.1.10 Page 13 of 47
Apr 26, 2011
4. Special Function Registers (SFRs)
An SFR (special function register) is a control register for a peripheral function. Tables 4.1 to 4.12 list the special
function registers. Table 4.13 lists the ID Code Areas and Option Function Select Area.
Table 4.1 SFR Information (1)
(1)
X: Undefined
Notes:
1. The blank areas are reserved and cannot be accessed by users.
2. The CWR bit in the RSTFR register is set to 0 after power-on and voltage monitor 0 reset. Hardware reset, Software reset, or watchdog timer
reset does not affect this bit.
3. The CSPROINI bit in the OFS register is set to 0.
4. The LVDAS bit in the OFS register is set to 1.
5. The LVDAS bit in the OFS register is set to 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 00101000b
0007h System Clock Control Register 1 CM1 00100000b
0008h Module Standby Control Register MSTCR 00h
0009h System Clock Control Register 3 CM3 00h
000Ah Protect Register PRCR 00h
000Bh Reset Source Determination Register RSTFR
0XXXXXXXb
(2)
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 WDTC 00111111b
0010h
0011h
0012h
0013h
0014h
0015h High-Speed On-Chip Oscillator Control Register 7 FRA7 When shipping
0016h
0017h
0018h
0019h
001Ah
001Bh
001Ch Count Source Protection Mode Register CSPR 00h
10000000b
(3)
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 On-Chip Reference Voltage Control Register OCVREFCR 00h
0027h
0028h Clock Prescaler Reset Flag CPSRF 00h
0029h High-Speed On-Chip Oscillator Control Register 4 FRA4 When shipping
002Ah High-Speed On-Chip Oscillator Control Register 5 FRA5 When shipping
002Bh High-Speed On-Chip Oscillator Control Register 6 FRA6 When shipping
002Ch
002Dh
002Eh
002Fh High-Speed On-Chip Oscillator Control Register 3 FRA3 When shipping
0030h Voltage Monitor Circuit Control Register CMPA 00h
0031h Voltage Monitor Circuit Edge Select Register VCAC 00h
0032h
0033h Voltage Detect Register 1 VCA1 00001000b
0034h Voltage Detect Register 2 VCA2
00h
(4)
00100000b
(5)
0035h
0036h Voltage Detection 1 Level Select Register VD1LS 00000111b
0037h
0038h Voltage Monitor 0 Circuit Control Register VW0C
1100X010b
(4)
1100X011b
(5)
0039h Voltage Monitor 1 Circuit Control Register VW1C 10001010b
