PD17012GF-055_15 Datasheet, PDF (58/84 Pages) Renesas Technology Corp – SINGLE-CHIP MICROCONTROLLER WITH ON-CHIP PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR CAR-MOUNTED FM/MW/LW RADIO

6.4 Detecting the Detachable Panel
Timing chart for eliminating chattering
H
PNL pin
L
Mounted
Internal panel state
Dismounted
about 10 ms
: Timing to sense PNL input pin
µPD17012GF-055
1
If high level on the PNL pin is detected 10 times in succession, the panel is regarded as being dismounted
( 1 ) and the power is unconditionally turned off.
Detection of the mounted state proceeds according to the same timing.
If the panel is regarded as being mounted, the power state is checked when the panel is dismounted. If the
panel was dismounted in the power-on state, power-on is set. (For details about power transitions, refer to 6.5.2.
Timing of POWER ON ↔ POWER OFF transitions by detachable panel)
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