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4-7 Remote Control Output Operation
4-7-1 Overview
A remote control carrier pulse can be generated using the overflow of timer 3. Two
duty ratios of 1/2 or 1/3 can be selected.
4-7-2 Setup and Operation
(1)
Set the RMOEN flag of the remote control carrier output control register (RMCTR)to
"0" so that the remote control carrier output is switched off.
(2)
Set timer 3 to select the base period of the remote control carrier (the
width that the remote control carrier output pulse is held at a high level).
(3)
Set the RMDTY0 flag of the RMCTR register to select the carrier duty.
(4)
Set the P10 output data to "0" and set P10 to the output mode. And select the remote
control carrier output by setting the TMORM flag of the RMCTR register to "0".
(5)
The RMOEN flag of the RMCTR register controls whether the remote control carrier
output is on or off.
Even if the carrier output is at a high level, and the RMOEN flag is set to "0"
(off), the carrier waveform will be maintained by the synchronous circuit
Base period
set by TM3
RMOEN Output on
Output off
RMOUT
(1/3 duty)
Figure 4-7-1 Remote Control Carrier Output Waveform
Chapter 4 Timer Functions
Set bit 0 of the P1OMD register to
"1" at the same time the remote
control output is switched on, and
to "0" at the same time the remote
control output is switched off.
Remote Control Output Operation
79
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