MCIMX233CJM4B Datasheet, PDF (1200/1612 Pages) Freescale Semiconductor, Inc – i.MX23 Applications Processor Reference Manual

AUDIOIN/ADC
Table 28-12. HW_AUDIOIN_ADCVOL
33222222222211111111110000000000
10987654321098765432109876543210
Table 28-13. HW_AUDIOIN_ADCVOL Bit Field Descriptions
BITS
LABEL
RW RESET
31:29 RSRVD4
RO 0x0
28 VOLUME_UPDATE_PENDING RO 0x0
27:26 RSRVD3
25 EN_ADC_ZCD
24 MUTE
23:14 RSRVD2
13:12 SELECT_LEFT
11:8 GAIN_LEFT
7:6 RSRVD1
5:4 SELECT_RIGHT
3:0 GAIN_RIGHT
RO 0x0
RW 0x0
RW 0x1
RO 0x000
RW 0x0
RW 0x0
RO 0x0
RW 0x0
RW 0x0
DEFINITION
Reserved
Volume Update Pending. This bit is set to one by the
hardware when either an ADC left or right volume
update is pending, i.e., waiting on a zero crossing. The
bit is set following a write to either the GAIN_LEFT or
GAIN_RIGHT bit fields and is cleared when both gain
values are applied to the input coincident with
zero-crossings in both the right and left channels. This
status bit is not used when EN_ADC_ZCD=0.
Reserved
Enable Zero Cross Detect for ADC Amplifier.
ADC Mute. When set, this bit mutes both the left and
right channel analog inputs. 1=Mute. 0=Unmute.
Reserved
ADC Left Channel Input Source Select. This bit field is
used to select the analog input source of the ADC's left
channel. 00=Microphone. 01=Line1. 10=Headphone.
11=Line2 (169-BGA only). Line2 left input is LRADC2.
Left Channel ADC Gain. This bit selects the level of
gain applied to the left channel analog input. Each
increment of this field represents a 1.5dB gain.
Programming a value of 0x0, applies a 0dB gain, 0x1
applies a 1.5dB gain, and so on up to a maximum gain
of 22.5dB when a value of 0xF is used.
Reserved
ADC Right Channel Input Source Select. This bit field
is used to select the analog input source of the ADC's
right channel. 00=Microphone. 01=Line1.
10=Headphone. 11=Line2 (169-BGA only).
Right Channel ADC Gain. This bit selects the level of
gain applied to the right channel analog input. Each
increment of this field represents a 1.5-dB gain.
Programming a value of 0x0, applies a 0-dB gain, 0x1
applies a 1.5-dB gain, and so on up to a maximum gain
of 22.5 dB when a value of 0xF is used.
28-18
i.MX23 Applications Processor Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor