參數(shù)資料
型號(hào)： C1851BCU
廠商： NEC Corp.
英文描述： I2C BUS-COMPATIBLE US MTS PROCESSING LSI
中文描述： I2C總線兼容美國(guó)的多邊貿(mào)易體制處理LSI
文件頁(yè)數(shù)： 33/60頁(yè)
文件大?。?/td> 447K
代理商： C1851BCU
39
PC1851B
Data Sheet S13417EJ2V0DS00
(3) Stereo, SAP broadcast reception (reception status) detection
Whether SAP or stereo broadcast is being received and the
PC1851B outputs the audio signal can be detected
with bits D2 and D3 of the read register. The register data become “1” only if the SAP signal (5 fH) is detected when
the SAP broadcast reception is selected, or if the stereo pilot signal is detected when the stereo broadcast reception
is selected.
Figure 4-12.
Stereo, SAP Broadcast Reception (Reception Status) Detection
(4) Noise detection
Noise can be detected with bit D4 of the read register. It is monitored in the vicinity of the 11.5 fH (180 kHz) signal
level.
During noise detection, the operation of the SAP demodulator block and the stereo demodulation block is interrupted
(Refer to section 4.3 (1) Stereo/SAP output stop function during noise detection).
Figure 4-13.
Noise Detection
D7
D6
D5
D4
D3
D2
D1
D0
Power-on
reset
Noise
detection
11
Broadcast status
Stereo
broadcast
SAP
broadcast
Stereo
broadcast
reception
SAP
broadcast
reception
Reception status
0
1
Noise detection
Noise
No noise
0
1
0
1
Stereo broadcast reception
Outputing SAP broadcast
No outputing SAP broadcast
SAP broadcast reception
No outputing stereo broadcast
Outputing stereo broadcast
D7
D6
D5
D4
D3
D2
D1
D0
Power-on
reset
Noise
detection
11
Broadcast status
Stereo
broadcast
SAP
broadcast
Stereo
broadcast
reception
SAP
broadcast
reception
Reception status
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