
REJ03B0271-0100 Rev.1.00 Sep 15, 2009
Page 29 of 113
M16C/63 Group
4. Special Function Registers (SFRs)
4.
Special Function Registers (SFRs)
4.1
SFRs
An SFR is a control register for a peripheral function.
Table 4.1 to
Table 4.15 list SFR information.
Notes:
X: Undefined
1.
The blank areas are reserved. No access is allowed.
2.
Software reset, watchdog timer reset, oscillator stop detect reset, voltage monitor 1 reset, and voltage monitor 2 reset do not affect the following
bits and registers: the VCR1 register, the VCR2 register, and bits PM01 and PM00 in the PM0 register.
3.
Oscillator stop detect reset does not affect bits CM20, CM21, and CM27.
4.
The state of bits in the RSTFR register depends on the reset type.
5.
This is the reset value when the LVDAS bit of address OFS1 is 1 during hardware reset.
6.
This is the reset value after voltage monitor 0 reset, power-on reset, and when the LVDAS bit of address OFS1 is 0 during hardware reset.
Table 4.1
SFR Information (1/16) (1) Address
Register
Symbol
Reset Value
0000h
0001h
0002h
0003h
0004h
Processor Mode Register 0
PM0
0000 0000b (CNVSS pin is low)
0000 0011b (CNVSS pin is high)
(2)0005h
Processor Mode Register 1
PM1
0000 1000b
0006h
System Clock Control Register 0
CM0
0100 1000b
0007h
System Clock Control Register 1
CM1
0010 0000b
0008h
Chip Select Control Register
CSR
01h
0009h
External Area Recovery Cycle Control Register
EWR
XXXX XX00b
000Ah
Protect Register
PRCR
00h
000Bh
Data Bank Register
DBR
00h
000Ch
Oscillation Stop Detection Register
CM2
000Dh
000Eh
000Fh
0010h
Program 2 Area Control Register
PRG2C
XXXX XX00b
0011h
External Area Wait Control Expansion Register
EWC
00h
0012h
Peripheral Clock Select Register
PCLKR
0000 0011b
0013h
Sub Clock Division Control Register
SCM0
XXXX X000b
0014h
0015h
Clock Prescaler Reset Flag
CPSRF
0XXX XXXXb
0016h
Peripheral Clock Stop Register
PCLKSTP1
X000 0000b
0017h
0018h
Reset Source Determine Register
RSTFR
XX00 001Xb (hardware reset)
(4)0019h
Voltage Detector 2 Flag Register
VCR1
001Ah
Voltage Detector Operation Enable Register
VCR2
001Bh
Chip Select Expansion Control Register
CSE
00h
001Ch
001Dh
001Eh
Processor Mode Register 2
PM2
XX00 0X01b
001Fh