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Initial values: PLO = 0, PLl = 1 Caution: 1.When PLO is 0 (normal operation), the lC detects the presence or absence of the ARI signal and reproduces the RDS data by automatically controlling the demodulation phase with respect to the reproduced carrier. However, the initial phase following a synchronization reset is set by PLl. 2.lf PLO is set t0 1, the demodulation circuit phase is locked according to the PLl setting at either 900 (PLl = 0) or oo (PLl = 1), allowing RDS data to be reproduced. When ARI is not present, PLl should be set t0 0, since the RDS data is reproduced by detecting at a phase of 90 with respect to the reproduced carrier. When ARI is present, PLl should be set t0 1, since detection is at oo. In cases where the ARI presence is known in advance, more stable reproduction can be achieved by fixing the demodulation phase in this manner.