C1851BCU NEC, C1851BCU Datasheet - Page 39

• Manufacturer Part Number: C1851BCU
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• Manufacturer: NEC

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(3) Stereo, SAP broadcast reception (reception status) detection
with bits D2 and D3 of the read register. The register data become “1” only if the SAP signal (5 f
the SAP broadcast reception is selected, or if the stereo pilot signal is detected when the stereo broadcast reception
is selected.
(4) Noise detection
level.
(Refer to section 4.3 (1) Stereo/SAP output stop function during noise detection).
Whether SAP or stereo broadcast is being received and the PC1851B outputs the audio signal can be detected
Noise can be detected with bit D4 of the read register. It is monitored in the vicinity of the 11.5 f
During noise detection, the operation of the SAP demodulator block and the stereo demodulation block is interrupted
Power-on
reset
D7
Power-on
reset
D7
broadcast
Figure 4-12. Stereo, SAP Broadcast Reception (Reception Status) Detection
Stereo
D6
Broadcast status
broadcast
Stereo
D6
Broadcast status
broadcast
SAP
D5
broadcast
SAP
D5
detection
Figure 4-13. Noise Detection
Noise
D4
Data Sheet S13417EJ2V0DS00
detection
Noise
D4
broadcast
reception
Stereo
Reception status
D3
broadcast
reception
Noise detection
Stereo
0
1
Reception status
D3
No noise
Noise
broadcast
reception
SAP
D2
broadcast
reception
SAP
D2
SAP broadcast reception
Stereo broadcast reception
0
0
1
1
No outputing stereo broadcast
Outputing stereo broadcast
No outputing SAP broadcast
Outputing SAP broadcast
D1
1
D1
1
H
D0
1
) is detected when
H
(180 kHz) signal
PC1851B
D0
1
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