參數(shù)資料
型號(hào)： UPC1854A
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)： 29/48頁(yè)
文件大?。?/td> 251K
代理商： UPC1854A
μ
PC1854A
29
Data Sheet S12816EJ3V0DS00
(3) Stereo, SAP broadcast reception (reception status) detection
Whether SAP or stereo broadcast is being received and the
μ
PC1854A outputs the audio signal can be de-
tected with bits D2 and D3 of the read register. The register data become “1” only if the SAP signal (5 f
H
) 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 4-7. 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 f
H
(180 kHz)
signal level and noise is detected.
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 4-8. Noise Detection
0
1
0
1
Stereo broadcast reception
Outputting SAP broadcast
No outputting SAP broadcast
SAP broadcast reception
No outputting stereo broadcast
Outputting stereo broadcast
D7
D6
D5
D4
D3
D2
D1
D0
Power-on
reset
Noise
detection
1
1
Broadcast status
Stereo
pilot
SAP
signal
Stereo
broadcast
reception
SAP
broadcast
reception
Reception status
D7
D6
D5
D4
D3
D2
D1
D0
Power-on
reset
Noise
detection
1
1
Broadcast status
Stereo
pilot
SAP
signal
Stereo
broadcast
reception
SAP
broadcast
reception
Reception status
0
1
Noise detection
Noise
No noise
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