PD178016GC-051_15 Datasheet, PDF (34/96 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
Momentary key
Description
UP
DOWN
These keys act as auto-seek and manual seek keys in radio mode. In CD changer mode, they act as up
and down keys for track/search. In tape mode, they act as FF and REW keys. While the clock is displayed,
these keys are used to adjust the clock.
(1) In radio mode
• ^{When used for auto-seek}
While the “AUTO” indicator is lit in radio mode, these keys are used to perform auto-seek. Pressing a
key instigates a search for a station. Once a station has been detected, the device receives that
station.
In RDS mode, RDS seek is performed. In TP/SK mode, TP/SK seek is performed. In PTY display
mode, PTY seek is performed.
• ^{When used for manual seek}
While the “AUTO” indicator is not lit in radio mode, these keys are used for manual seek.
Each time the key is pressed, the frequency is increased or decreased by 1 step (1 channel
separation), respectively. When either key is pressed and held down for about 0.5 seconds, the
frequency is continuously increased or decreased at a rate of about one step every 50 ms,
respectively, until the key is released.
In PTY display mode, PTY seek is performed.
(2) In tape mode
Pressing the UP key fast-forwards the tape. Pressing the DOWN key rewinds the tape.
While AMS is ON, AMS FF/REW is performed. A search is made for the beginning of a track, then that
track is played.
While AMS is OFF, FF/REW is performed.
During FF/REW operation, LCD indicator “ ” or “ ” blinks.
(3) In CD changer mode
If either of these keys is held down for about 0.5 seconds, search up/down is performed for as long as
the key is held down. If the key is released within 0.5 seconds, 1-track up/down operation is performed.
During track up/down operation, the LCD panel switches to the display of the track number. During
search up/down operation, the panel switches to the time display.
(4) When used to adjust the clock
By pressing the UP or DOWN key in clock adjustment mode, the hour and minute digits of the clock
can be adjusted.
• Adjustment of the hour digits
Each time the UP key is pressed, the hour digits of the clock are incremented by one.
When the key is held down for about 0.5 seconds, the digits increment continuously every 0.2 seconds
until the key is released.
While the hour digits are being adjusted, the minute digits and second count value are not affected.
• Adjustment of the minute digits
Each time the DOWN key is pressed, the minute digits of the clock are incremented by one.
When the key is held down for about 0.5 seconds, the digits increment continuously every 0.1 seconds
until the key is released. There is no carry-over to the hour digits.
When clock adjustment is completed by pressing the DISP/ADJ key, the second digits are cleared to 0.
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