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

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UPD6121

REMOTE CONTROL TRANSMISSION CMOS IC

NEC => Renesas Technology 

µPD6121, 6122

6. DOUBLE-INPUT OPERATION

All keys are provided with a multiple-input prevention circuit. When two or more keys are pressed simulta-

neously, no signal is transmitted; but when the keys K21 and K22, K21 and K23, or K21 and K24 are pressed

together, D5 is set to “1”. However, the way keys are pressed determines the priority: If K22/K23/K24 are pressed

126 ms or longer after K21 is pressed, transmission is performed in this mode.

Double-input key operation is ideally suited for tape recording error prevention applications.

KEY

K21 + K22

K21 + K23

K21 + K24

Double-Input Operation Key Codes

D0

D1

D2

D3

D4

D5

1

0

1

0

1

1

0

1

1

0

1

1

1

1

1

0

1

1

D6

D7

0

0/1

0

0/1

0

0/1

1 Double-input transmission

Double-Input Operation Timing

K21

push

K21 code transmission

t > 126 ms

2 No operation

D5 + K22/K23/K24 code transmission

K22/K23/K24

push

K21

push

3 No operation

K21 code transmission

36 ms < t < 126 ms

K22/K23/K24

push

Transmission stop

K21

push

–36 ms < t < 36 ms

K22/K23/K24

push

4 No operation

No transmission

t > 126 ms

K22/K23/K24 code transmission

K22/K23/K24

K21

push

push

Transmission stop

13

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