UPD6P8 datasheet(97/101 Pages) RENESAS

97 / 101 page

µPD6P8, 6P8A, 6P8B

Data Sheet U17848EJ5V0DS

APPENDIX B. EXAMPLE OF REMOTE CONTROL TRANSMISSION FORMAT

(In the case of NEC transmission format in command one-shot transmission mode)

Caution When using the NEC transmission format, please apply for a custom code at NEC Electronics.

(1) REM output waveform (from <2> on, the output is made only when the key is kept pressed)

REM output

58.5 to 76.5 ms

108 ms

< 1 >

< 2 >

Remark If the key is repeatedly pressed, the power consumption of the infrared light-emitting diode (LED) can

be reduced by sending the reader code and the stop bit from the second time.

(2) Enlarged waveform of <1>

REM output

13.5 ms

Leader code

9 ms

4.5 ms

Custom code

8 bits

Custom code’

8 bits

Data code

8 bits

Data code

8 bits

27 ms

18 to 36 ms

58.5 to 76.5 ms

Stop Bit

1 bit

< 3 >

(3) Enlarged waveform of <3>

REM output

9 ms

13.5 ms

4.5 ms

2.25 ms

1.125 ms

0.56 ms

(4) Enlarged waveform of <2>

REM output

9 ms

11.25 ms

2.25 ms

0.56 ms

Stop Bit

Leader code

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