RL78/I1D
Operation state switching IAR
R01AN3597EJ0100 Rev.1.00
Page 19 of 42
Jan. 31, 2017
Symbol: CMC
7
6
5
4
3
2
1
0
EXCLK
OSCSEL EXCLKS OSCSELS
0
AMPHS1 AMPHS0
AMPH
0
0
0
0
0
0
0
0
Bits 7 and 6
EXCLK
OSCSEL
High-speed system clock pin
operation mode
X1/P121 pin
X2/EXCLK/P122 pin
0
0
Input port mode
Input port
0
1
X1 oscillation mode
Crystal/ceramic resonator connection
1
0
Input port mode
Input port
1
1
External clock input mode
Input port
External clock input
Bits 5 and 4
EXCLKS OSCSELS
Subsystem clock pin
operation mode
XT1/P123 pin
XT2/EXCLKS/P124
pin
0
0
Input port mode
Input port
0
1
XT1 oscillation mode
Crystal resonator connection
1
0
Input port mode
Input port
1
1
External clock input mode
Input port
External clock input
Caution: For details on the register setup procedures, refer to RL78/I1D User's Manual: Hardware.
Clock operation mode control register (CMC)
High-speed system clock pin operation mode: Input port mode
Subsystem clock pin operation mode: Input port mode
Setting up the clock operation mode
