upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 210

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

8.4.3 Carrier generator operation
and 8-bit timer/event counter 51 is used to generate an infrared remote control signal (time count).
and the carrier pulse is output from the TOH1 output.
(1) Carrier generation
(2) Carrier output control
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In the carrier generator mode, 8-bit timer H1 is used to generate the carrier signal of an infrared remote controller,
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,
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.
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
0
0
1
1
Preliminary User’s Manual U19014EJ1V0UD
CHAPTER 8 8-BIT TIMER H1
NRZB1 Bit
0
1
0
1
Low-level output
High-level output
Low-level output
Carrier pulse output
Output