CHAPTER 8 8-BIT TIMER H1
Preliminary User’s Manual U19014EJ1V0UD
210
8.4.3 Carrier generator operation
In the carrier generator mode, 8-bit timer H1 is used to generate the carrier signal of an infrared remote controller,
and 8-bit timer/event counter 51 is used to generate an infrared remote control signal (time count).
The carrier clock generated by 8-bit timer H1 is output in the cycle set by 8-bit timer/event counter 51.
In carrier generator mode, the output of the 8-bit timer H1 carrier pulse is controlled by 8-bit timer/event counter 51,
and the carrier pulse is output from the TOH1 output.
(1) Carrier
generation
In carrier generator mode, 8-bit timer H compare register 01 (CMP01) generates a low-level width carrier pulse
waveform and 8-bit timer H compare register 11 (CMP11) generates a high-level width carrier pulse waveform.
Rewriting the CMP11 register during the 8-bit timer H1 operation is possible but rewriting the CMP01 register is
prohibited.
(2) Carrier output control
Carrier output is controlled by the interrupt request signal (INTTM51) of 8-bit timer/event counter 51 and the
NRZB1 and RMC1 bits of the 8-bit timer H carrier control register (TMCYC1). The relationship between the
outputs is shown below.
RMC1 Bit
NRZB1 Bit
Output
0 0
Low-level
output
0 1
High-level
output
1 0
Low-level
output
1
1
Carrier pulse output
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