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UPD17006AGF-011 Fiches technique(PDF) 46 Page - NEC |
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UPD17006AGF-011 Fiches technique(HTML) 46 Page - NEC |
46 / 72 page 46 µPD17006AGF-011 (d) AF operation 2-2 • When initial setting diode AFSEL = 0 AF is selected by the following procedure: 1 The AF list currently received (up to 25 stations) is sorted in order of frequency. 2 The SD pin is checked from the highest frequency, and up to eight stations of signal meter levels are stored when a station is detected. 3 Based on the result in 2 , the AF is selected starting from the station with the highest signal meter level. 4 If an RDS station is detected in the course of AF selection, the PI code is checked. At this time, the PI code is checked as follows: When the region mode is selected because the initial setting diode REGEN = 1 and the REGION key is asserted, coincidence of the 12-bit PI code excluding the area cover code of the PI code is detected; otherwise, coincidence of a 16-bit PI code is detected. The AF operation is completed when detection of coincidence of the PI code is successful, and an RDS station is received. 5 If AF selection fails in 4 , the station before AF selection was performed is retained. • When initial setting diode AFSEL = 1 The AF of each station is changed every 5 seconds. If changing the AF fails, the original station is retained. (3) PI search operation If AF selection fails when AF operation 1 has been performed, and RDS mode is set, a PI search operation is performed by the following procedure: 1 Stations are searched in the up direction in 100-kHz steps to make a pass through the band, starting from the frequency received before failure of AF selection. 2 A station is detected. If it is not an RDS station, proceed to the next step. If it is an RDS station, the PI code is checked. The PI code is checked as follows: When the region mode is selected because the initial setting diode REGEN = 1 and the REGION key is asserted, coincidence of the 12-bit PI code excluding the area cover code of the PI code is detected; otherwise, coincidence of a 16-bit PI code is detected. 3 If detection of coincidence of the PI code is successful in 2 , the AF operation is completed, and the station is received. 4 If detection of coincidence of the PI code fails in 2 , and if coincidence of the PI code is not detected after the PI search is performed, passing through the band, the frequency before the PI search is retained, and the AF operation is completed. 4.1.5 EON (Enhanced Other Network) The EON information sent as block 3 of group type 14A uses the AF list of the network of the other station and mapped FM frequency. Group type 14A and data are input by the following procedure: |
Numéro de pièce similaire - UPD17006AGF-011 |
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Description similaire - UPD17006AGF-011 |
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