D6122G NEC, D6122G Datasheet - Page 13

• Manufacturer Part Number: D6122G
• Description: Search -----> UPD6122G
• Manufacturer: NEC

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6. DOUBLE-INPUT OPERATION
neously, no signal is transmitted; but when the keys K21 and K22, K21 and K23, or K21 and K24 are pressed
together, D
126 ms or longer after K21 is pressed, transmission is performed in this mode.
All keys are provided with a multiple-input prevention circuit. When two or more keys are pressed simulta-
Double-input key operation is ideally suited for tape recording error prevention applications.
1 Double-input transmission
2 No operation
3 No operation
4 No operation
5
is set to “1”. However, the way keys are pressed determines the priority: If K22/K23/K24 are pressed
K21 + K22
K21 + K23
K21 + K24
K22/K23/K24
KEY
push
push
push
K21
K21
K21
push
K22/K23/K24
–36 ms < t < 36 ms
K21 code transmission
K21 code transmission
K22/K23/K24 code transmission
push
36 ms < t < 126 ms
D
1
0
1
0
t > 126 ms
Double-Input Operation Key Codes
D
t > 126 ms
0
1
1
Double-Input Operation Timing
K22/K23/K24
1
push
D
1
1
1
No transmission
2
K22/K23/K24
D
push
0
0
0
3
push
K21
D
Transmission stop
5
+ K22/K23/K24 code transmission
D
1
1
1
4
D
1
1
1
5
Transmission stop
D
0
0
0
6
PD6121, 6122
0/1
0/1
0/1
D
7
13