PD17012GF-055_15 Datasheet, PDF (43/84 Pages) Renesas Technology Corp – SINGLE-CHIP MICROCONTROLLER WITH ON-CHIP PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR CAR-MOUNTED FM/MW/LW RADIO

µPD17012GF-055
6. MUTE TIMING
6.1 Tuner Operation
The operation of the tuner function and the output of the MUTE pin are explained in the following order.
(1) Preset memory reading (refer to 6.1.1 Preset memory reading)
(2) Preset scan (refer to 6.1.2 Preset scan)
(3) Preset memory writing (refer to 6.1.3 Preset memory writing)
(4) Seek up/down (refer to 6.1.4 Seek up/down)
(5) Manual up/down (refer to 6.1.5 Manual up/down)
(6) Auto store memory (refer to 6.1.6 Auto store memory)
(7) AF switchover (refer to 6.1.7 AF switchover)
6.1.1 Preset memory reading
Reading in the preset memory is performed by pressing key
M1
to
M6
for less than 2 seconds
when initialize diode MESEL = 0 in TUNER mode, or by pressing these keys in modes other than preset memory
write enable mode when MESEL = 1.
The timing chart showing the preset memory reading operation is shown below.
PI seek is performed if the broadcasting station being read is an FM RDS station.
Figure 6-1. Timing Chart in Preset Memory Read (1/3)
(When the Broadcasting Station Being Read Is Not RDS Station)
MUTE
1
40 ms
23
4
290-300 ms
Preset memory read determined
1 MUTE first-out and beep output
2 Frequency division ratio setting
3 PLL lock wait
4 MUTE last-out output
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