PD178016GC-051_15 Datasheet, PDF (42/96 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER WITH BUILT-IN PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR AUTOMOTIVE FM/MW/LW RADIO APPLICATIONS

µPD178016GC-051
Figure 3-1. Signal Meter Reading Ranges (where SMT_A/B voltage > SMT_B/C voltage)
Signal meter reading (V)
(pin 3)
Input voltage of SMT_A/B pin
(pin 1)
Input voltage of SMT_B/C pin
(pin 2)
Range A
Range B
Range C
The boundary voltages between the adjacent ranges are those voltages input to the SMT_A/B pin and
SMT_B/C pin when the power is first applied.
These voltages must be input so that SMT_A/B voltage > SMT_B/C voltage.
If SMT_A/B voltage ≤ SMT_B/C voltage, the SMT_B/C voltage is invalid, so that the SMT_A/B voltage is used
as the boundary voltage.
In this case, two ranges, A and C, are used, as shown below.
Figure 3-2. Signal Meter Reading Ranges (where SMT_A/B voltage ≤ SMT_B/C voltage)
Signal meter reading (V)
(pin 3)
Supply voltage VDD = 5 V
Input voltage of SMT_A/B pin
(pin 1)
Range A
Range C
(c) Determining the decode state
<1> Calculate the average of ten blocks, decoded in one second, and use this average as the decode state
(number/number pending).
<2> The number of blocks remains pending until ten items of data have been read after the frequency has
been changed.
<3> If the RDS pin is high when the number of blocks is read, the number of blocks at that time will be 0.
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