參數(shù)資料
型號： UPD178024GF
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述： 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁數(shù)： 43/98頁
文件大?。?/td> 467K
代理商： UPD178024GF
Data Sheet U14608EJ1V0DS00
43
μ
PD178024GC-051
Momentary Key
Function
VOL SEL/VOL CLR
(2) Operation of VOL CLR key
This key returns the set values in all the modes of the electronic volume, loudness status, and SRS
status to the original conditions.
If this key is pressed for 4 seconds or longer, the set value of each mode of the electronic volume is
returned to the default value at power application, and the loudness status and SRS status are
turned off.
These keys increase or decrease the volume in each adjustment mode of the electronic volume.
They are valid in the power-on status.
However, they are invalid if telephone mute is turned on by using the PMUTE pin (pin 47).
When the VOL UP key is pressed, the volume in an adjustment mode is increased.
When the VOL DWN key is pressed, the volume is decreased.
If either of these keys is held down for 500 ms or longer, the operation is repeatedly performed every
125 ms, until the key is released.
If either of these keys is pressed while the electronic volume is not being displayed, the main volume
is displayed and, at the same time, the volume of the main volume is increased or decreased.
The operation of these keys is as follows in each adjustment mode of the electronic volume.
Mode
Operation
Volume
Increments or decrements the volume of the main volume.
Bass
Increments or decrements the volume of bass (low-frequency region).
Treble
Increments or decrements the volume of treble (high-frequency region).
Balance
Increments (moves to the right) or decrements (moves to the left) the
volume balance between the left and the right.
Fader
Increments (moves forward) or decrements (moves backward) the
volume balance between front and rear.
VOL UP
VOL DWN
On power application, the volume value in each mode is set to the default value.
For the default value in each mode, refer to “11.1 Electronic Volume Functions”.
When the power is turned on or when the standby mode is released, the main volume value is
returned to the default value if it is greater than the default value. If the main volume value is less
than the default value, it is retained.
At this time, the volume value in each of the bass, treble, balance, and fader modes is retained,
regardless of whether the value is greater or less than the default value.
For the correspondence between the displayed volume value and the set values of the electronic
volume IC, refer to “11.2 Electronic Volume IC (TDA7313) Set Values”.
If an operation other than that to adjust the volume is performed or if no key is pressed for 5 seconds
while the electronic volume is being displayed, the electronic volume display terminates.
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