PD17012GF-055_15 Datasheet, PDF (52/84 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
6.1.6 Auto store memory
The operation is started by pressing the
ASM
key when the device is in TUNER mode.
The timing chart below shows the auto store memory operation.
Figure 6-6. Timing Chart in Auto Store Memory
MUTE
1
23
40 ms
4
10 ms
23
4
10 ms
5
23
10 ms
Key ON Lowest
frequency set
Without station
With station
With station
(Preset memory 1 write)
223
6
290-300 ms
7 (Band edge)
1 MUTE first-out and beep output
2 Frequency division ratio setting
3 PLL lock wait
4 SD stability wait (1)
5 SD stability wait (2)
6 MUTE last-out output
7 ASM end. Sorted in the ascending order of the frequency to call preset memory M1. If no station
is detected, the frequency before pressing the key is retained. If the relevant station is detected after
writing the preset memories up to M6, it is compared with the SD levels of the written preset memories
and stored whose SD levels is high.
50