MITSUBISHI MICROCOMPUTERS
4551 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for
INFRARED REMOTE CONTROL TRANSMITTER
CONTROL REGISTERS (CONTINUED)
Carrier wave selection register C1
Carrier wave selection bits
at reset : 01112
at power down : 01112
W
C13 C12 C11 C10 Carrier wave frequency
0 0 0 0 STCK/24
1/3
0 0 0 1 STCK/24
1/2
0 0 1 0 STCK/16
1/4
0 0 1 1 STCK/16
1/2
0 1 0 0 STCK/2
1/2
0 1 0 1 No carrier wave
0 1 1 0 Not available
0 1 1 1 “L” fixed
1 0 0 0 STCK/12
1/3
1 0 0 1 STCK/12
1/2
1 0 1 0 STCK/8
1/4
1 0 1 1 STCK/8
1/2
1 1 0 0 STCK
1/2
1 1 0 1 No carrier wave
1 1 1 0 Not available
1 1 1 1 “L” fixed
Duty
Carrier wave output control register C2
at reset : 02
at power down : 02
W
C20 Carrier wave output auto-control bit
0 Auto-control output by timer 1 is invalid
1 Auto-control output by timer 1 is valid
Carrier wave generating control flag CR
at reset : 02
at power down : 02
W
CR Carrier wave generating control
Note: “W” represents write enabled.
0 Carrier wave generating stop (SPCR instruction)
1 Carrier wave generating start (STCR instruction)
60