UPD6121 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD6121

REMOTE CONTROL TRANSMISSION CMOS IC

NEC => Renesas Technology 

µPD6121, 6122

4. REMOTE OUTPUT WAVEFORM (NEC TRANSMISSION FORMAT:

ONE-SHOT COMMAND TRANSMISSION MODE)

• When fOSC = 455 kHz

(1) Remote (REM) output (from stage 2 , transmission occurs only when key is kept depressed)

REM output

58.5 to 76.5 ms

108 ms

1

(2) Magnification of stage 1

3

REM output

108 ms

2

9 ms 4.5 ms

13.5 ms

Leader Code

Custom Code

8 bits

Custom Code’

8 bits

18 ms to 36 ms

58.5 ms to 76.5 ms

Data Code

8 bits

Data Code

8 bits

27 ms

(3) Magnification of waveform 3

Stop Bit

1 bit

REM output

9 ms

13.5 ms

(4) Magnification of waveform 2

4.5 ms

0.56 ms

1.125 ms 2.25 ms

0

1

1

00

REM output

9 ms

2.25 ms

11.25 ms

Leader Code

(5) Carrier waveform (Magnification of HIGH period of codes)

0.56 ms

Stop Bit

REM output

8.77 µs

26.3 µs

9 ms or 0.56 ms

Carrier frequency: fc = fosc/12 = 38 kHz

Remark If a key is kept depressed, the second and subsequent times, only the leader code and the stop

bit are transmitted, which allows power savings for the infrared-emitting diode. If a command is

issued continuously in the same way the second and subsequent times as the first time, refer to

7. ONE-SHOT/CONTINUOUS COMMAND TRANSMISSION MODE.

11

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