M34551 View Datasheet(PDF) - MITSUBISHI ELECTRIC
Part Name
Description
Manufacturer
M34551
MITSUBISHI ELECTRIC
M34551 Datasheet PDF : 68 Pages
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MITSUBISHI MICROCOMPUTERS
4551 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for
INFRARED REMOTE CONTROL TRANSMITTER
CARRIER GENERATING CIRCUIT
The 4551 Group has a carrier generating circuit that generates
the transfer waveform by dividing the system clock (STCK) for
each remote control carrier wave. Each carrier waveform can be
output by setting the carrier wave selection register (C1).
Also, timer 1 can auto-control the carrier wave output from port
CARR by setting the carrier wave output control register (C2).
Carrier wave selection register C1
Register C1
STCR instruction
Setting value
(at reset: 0 1 1 1 2, at power down: 0 1 1 1 2, W)
Output waveform
SPCR instruction
Carrier wave
C13 C12 C11 C10
Frequency Duty
0
0
0
0 “H”
“L”
0
0
0
1 “H”
“L”
1/3
STCK/24
1/2
0
0
1
0 “H”
“L”
0 0 1 1 “H”
“L”
1/4
STCK/16
1/2
0 1 0 0 “H”
“L”
0 101
“H”
1 1 0 1 “L”
0 110
1 110
0 1 1 1 “H”
“L”
1 111
1 0 0 0 “H”
“L”
1
0
0
1 “H”
“L”
STCK/2 1/2
No carrier wave
No available
“L” fixed
1/3
STCK/12
1/2
1
0
1
0 “H”
“L”
1 0 1 1 “H”
“L”
1/4
STCK/8
1/2
1 1 0 0 “H”
“L”
Note:“W” represents write enabled.
STCK
1/2
Fig. 22 Carrier wave selection register
23
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