Renesas RL78/I1D Application Note page 19

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