LC78626E Datasheet, PDF (22/32 Pages) Sanyo Semicon Device – DSP for Compact Disk Players

LC78626E
11 The Bilingual Function
Code
$28
$29
$2A
COMMAND
STO CONT
Lch CONT
Rch CONT
RES = low
q
* At reset or when a stereo command ($28) has been entered, Lch and Rch are output, respectively, to Lch and Rch.
* When the Lch set command ($29) is entered, the Lch data is output to both Lch and Rch.
* When the Rch set command ($2A) is entered, the Rch data is output to both Lch and Rch.
12 Deemphasis Pin 45: EMPH
Of the subcode Q control data, the pre-emphasis On/Off bit is output from the EMPH pin. When this pin is high, the
deemphasis circuit within this IC is activated, and the D/A converter output are de-emphasized.
13 The Digital Attenuator
It is possible to apply digital attenuation to the audio data by setting the RWC high and inputting from the COIN a
two byte command synchronized with the CQCK clock.
Code
$81
$82
$83
$84
$85
$86
$87
COMMAND
ATT DATA
SET
ATT 4STEP
UP
ATT 4STEP
DOWN
ATT 8STEP
UP
ATT 8STEP
DOWN
ATT 16STEP UP
ATT 16STEP DOWN
RES = low
DATA 00H Set
(MUTE –∞dB)
After reset, the attenuation level is set to “MUTE” (the attenuation coefficient is 00H, where MUTE = –∞), and thus
it is necessary to directly set the attenuation coefficient EEH using the direct set (ATT DATA SET) command in
order to produce a sound. The attenuation level can be set to a range from 00H to EEH (239 different levels) by the
microcontroller commands.
This two byte command is different from the two byte commands used in track counting in that RWC only needs to
be set once, and it is not necessary to reset the two byte command either. (See the two byte command RWC1 set on
page 13.)
Command
Attenuation data 00H to EEH
Attenuate set command
After inputting the target attenuation level in terms of 00H to EEH, then if the attenuate step-up/step-down
commands are transmitted, the system steps closer to the target with the corresponding step size of 4, 8, or 16,
synchronized with the rising edge of LRSY. However, when the ATT DATA SET command has been used, then the
target value is set directly. When new data is entered during the transition, then the target value is approached from
whatever value is in effect at that time. Caution is required when using the step-up/step-down commands at this time.
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