UPD6121G-002 NEC, UPD6121G-002 Datasheet - Page 5

• Manufacturer Part Number: UPD6121G-002
• Description: REMOTE CONTROL TRANSMISSION CMOS IC
• Manufacturer: NEC

2. NEC TRANSMISSION FORMAT (REM OUTPUT)
Code, Custom Code’), and 16-bit data codes (Data Code, Data Code) at one time, as shown in Figure 2-1.
the ensuing code to facilitate reception detection.
between pulses.
The NEC transmission format consists of the transmission of a leader code, 16-bit custom codes (Custom
Also refer to 4. REMOTE OUTPUT WAVEFORM.
Data Code is the inverted code of Data Code.
The leader code consists of a 9-ms carrier waveform and a 4.5-ms OFF waveform and is used as leader for
Codes use the PPM (Pulse Position Modulation) method, and the signals “1” and “0” are fixed by the interval
Cautions 1. Use any of the possible 256 kinds of custom codes specified with 00xxH (diode not
Leader Code
2. When receiving data in the NEC transmission format, check that the 32 bits made up of the
connected), as desired. If intending to use custom codes other than 00xxH, please consult
NEC in order to avoid various types of errors from occurring between systems.
16-bit custom code (Custom Code, Custom Code’) and the 16-bit data code (Data Code, Data
Code) are fully decoded, and that there are no signals with the 33rd bit and after (be sure
to check also Data Code).
C
0
C
1
Custom Code
C
2
C
3
C
4
C
5
C
Figure 2-1. REM Output Code
6
C
7
C
C
C
or
0
0
0
’ C
C
C
or or or or or or or
1
1
1
Custom Code’
’ C
C
C
2
2
2
’ C
C
C
3
3
3
’ C
C
C
4
4
4
’ C
C
C
5
5
5
’ C
C
C
6
6
6
’ C
C
C
7
7
7
’ D
0
D
1
D
Data Code
2
D
3
D
4
D
5
D
6
D
7
D
0
PD6121, 6122
D
1
D
Data Code
2
D
3
D
4
D
5
D
6
D
7
5