upd178016 Renesas Electronics Corporation., upd178016 Datasheet - Page 25

• Manufacturer Part Number: upd178016
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

2.5.3 Momentary keys
keys together is invalid, and it is assumed that no key has been pressed.
Momentary key
The POWER key is effective even when pressed together with another momentary key. Pressing any other two
A BEEP sound (BEEP pin, pin 59) is output for 50 ms when a valid combination is pressed.
The functions of the momentary keys are described below (in alphabetical order).
BAND
AUTO
CDC
This key is used to select the auto or manual mode.
This key is valid in radio mode.
Each time it is pressed, auto or manual mode is selected alternately.
In auto mode, the LCD indicator “AUTO” lights.
Manual mode is set in the initial state when the power is first applied.
The functions of the UP and DOWN keys differ depending on the selected mode.
• Auto mode
• Manual mode
This key is used to switch a band or to select radio mode.
(1) In radio mode
(2) In CD changer/tape mode
This key is used to select CD changer mode in radio or tape mode, and is used to play back or pause the
CD changer in CD changer mode.
(1) In radio/tape mode
(2) In CD changer mode
The UP / DOWN keys are used to start auto seek up/down operation.
The UP / DOWN keys are used to start manual seek up/down operation.
This key is used to select a band. The frequency of the selected band will be displayed. The LCD
indicator corresponding to the selected band (“FM1”/“FM2”/“FM3”/“MW”/”LW”) lights.
Each time this key is pressed, the band is changed as follows:
The FM1 band is selected in the initial state when the power is first applied.
The outputs of the BAND0 and BAND1 pins are changed depending on the selected band, as indicated
in the following table.
This key is used to select radio mode.
The frequency is displayed for two seconds then PS is displayed for three seconds (if there is no PS,
the frequency is displayed for five seconds). Subsequently, the display returns to normal.
The LCD indicator indicating the most-recently selected band (“FM1”/“FM2”/“FM3”/“MW”/“LW”) lights.
Selects CD changer mode.
Plays back or pauses the CD changer.
FM1
FM2
(0: Low, 1: High)
FM
MW
LW
FM3
Band
MW/LW
BAND0 pin (pin 24)
Description
1
0
0
BAND1 pin (pin 25)
0
0
1
PD178016GC-051
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