參數(shù)資料
型號： UPD178024GC-051-8BT
廠商： NEC Corp.
元件分類： 通用總線功能
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLER WITH ON-CHIP PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR AUTOMOTIVE FM/MW/LW RADIO WITH CD PLAYER
中文描述： 8位單片機(jī)具有片上標(biāo)器，鎖相環(huán)頻率合成器，如柜臺，汽車調(diào)頻/中波/龍運(yùn)收音機(jī)帶CD播放器
文件頁數(shù)： 71/98頁
文件大?。?/td> 467K
代理商： UPD178024GC-051-8BT
Data Sheet U14608EJ1V0DS00
71
μ
PD178024GC-051
9. FRONT PANEL
9.1
Attached/Detached Front Panel
Power is turned on/off by detecting the attachment or detachment of the front panel using the DTH pin (pin 72).
(1) Timing of detecting attachment/detachment of front panel
The DTH pin (pin 72) is judged every 10 ms. If the pin is high five times in a row, it is assumed that the front
panel is detached. If the pin is low five times in a row, it is assumed that the front panel is attached.
If the DTH pin is not high or low five times in a row, the previous status of the front panel is retained.
DTH
Internal panel
condition
Low level
High level
Detached
Attached
Detection of panel detachment
Detection of panel attachment
DTH pin judgment timing
10 ms
(2) Operation based on attachment/detachment of front panel
If the front panel is detached, the power is turned off. It is not turned on until the front panel is attached
(forced power off status).
While the front panel is detached, the FL LED pin (pin 49) outputs a square wave with a frequency of 1 Hz
and a duty factor of 50% to blink an externally connected LED.
In the standby mode, however, this pin always outputs a low level, regardless of the status of the front panel.
Therefore, the LED remains dark.
If the front panel is reattached, the power can be turned on, however the power status immediately after the
front panel has been reattached is always off, regardless of the power status before the panel was detached.
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