Specifications

ESS Technology, Inc. SAM0025A-062397 67
ES1879 DATA SHEET
REGISTERS
PRELIMINARY
Serial Mode Output Control (44h, R/W)
Bits Definitions:
Serial Mode Miscellaneous Analog Control (46h, R/W)
Bits Definitions:
Output
override
Output signal Output volume
7 6543210
Bits Name Description
7 Output
override
1 = Output volume during serial mode is from
this register rather than from the Mixer Master
Volume register. Output signal control is
always in force during serial mode regardless
of the state of this bit.
0 = Output volume is unchanged during serial
mode.
6:4 Output
signal
Controls the signal routed to speaker outputs
AOUT_L and AOUT_R:
bit 6
bit 5 bit 4 signal
0 0 0 Mute.
0 0 1 No change from normal
operation.
0 1 0 Audio 1 only – playback
mixer bypassed (over-
rides record monitor and
record mute features).
0 1 1 No change from normal
operation.
1 0 0 Playback mixer with audio
1 DAC set to 0 dB attenu-
ation (overrides record
monitor and record mute
features).
1 0 1 Playback mixer output with
audio 1 DAC playback
muted (overrides record
monitor and record mute
features).
1 1 0 Reserved.
1 1 1 Reserved.
3:0 Output
volume
Replaces normal master volume setting if bit 7
is high during serial mode. 0 is mute. 15 is max-
imum (0 dB).
Analog
control
override
Music
mixer
test
Left
ADC
Right
ADC
Mono
enable
x
FDXO
enable
FDXI
enable
76543210
Bits Name Description
7 Analog
control
override
1 = Bits 6:0 take effect during serial mode.
0 = Bits 6:0 do not take effect during serial
mode.
6 Music
mixer test
Test feature.
1 = Music DAC mixer inputs replaced with
AUXBL/AUXBR inputs.
0 = Music DAC mixer inputs normal.
5 Left ADC 1 = Left channel combined ADC and DAC is in
ADC mode.
0 = Left channel combined ADC and DAC is in
DAC mode.
4Right
ADC
1 = Right channel combined ADC and DAC is
in ADC mode.
0 = Right channel combined ADC and DAC is
in DAC mode.
3 Mono
enable
This bit should be set appropriately for the
application as follows:
1 = Mono record, mono playback, or mono full-
duplex.
0 = Stereo record or stereo playback.
2– Don’t care.
1FDXO
enable
1 = Enables AUXBR as an output. The output
source is determined by mixer register 7Dh
bits [2:1]. AUXBL replaces AUXBR as an input
to the record and playback mixers.
0 = AUXBR is an input to the record and play-
back mixers.
0FDXI
enable
1 = Enables FDXI input connection from left
channel filter input and thus to the input of the
left channel ADC.
0 = FDXI input has 50K pull-up to CMR. The
left channel filter input and ADC comes from
the input volume stage as usual.