CS47L85 datasheet(330/370 Pages) CIRRUS

330 / 370 page

CS47L85

330

Rev 4.3

MICDET CLAMP SEQUENCES

The CS47L85 supports external accessory detection functions, including the MICDET Clamp circuit. The MICDET Clamp

status can be used to trigger the Control Write Sequencer. The MICDET Clamp is controlled by the JD1 and/or JD2 signals,

as described in Table 86.

A Control Write Sequence can be associated with a rising edge and/or a falling edge of the MICDET Clamp status. This is

configured using the register bits described in Table 86.

If one of the selected logic conditions is detected, the Control Write Sequencer will be triggered. The applicable start index

location within the sequencer memory is separately configurable for the rising and falling edge conditions.

The WSEQ_MICD_CLAMP_RISE_INDEX register defines the sequencer start index corresponding to a MICDET Clamp

Rising Edge (Clamp active) event, as described in Table 122. The WSEQ_MICD_CLAMP_FALL_INDEX register defines

the sequencer start index corresponding to a MICDET Clamp Falling Edge event.

Note that a sequencer start index of 1FFh will cause the respective sequence to be aborted.

The MICDET Clamp control sequences are undefined following Power-On Reset (POR), Hardware Reset, or following a

Sleep mode transition. The MICDET Clamp control sequences must be reconfigured by the host processor following any of

these events. Note that all control sequences are maintained in the sequencer memory through Software Reset.

See “External Accessory Detection” for further details of the MICDET Clamp status signals.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R102

(0066h)

Always_On

_Triggers_S

equence_S

elect_1

8:0

WSEQ_MICD_CL

AMP_RISE_INDE

X [8:0]

1FFh

MICDET Clamp (Rising) Write Sequence

start index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with MICDET Clamp (Rising) detection.

Valid from 0 to 507 (1FBh).

R103

(0067h)

Always_On

_Triggers_S

equence_S

elect_2

8:0

WSEQ_MICD_CL

AMP_FALL_INDE

X [8:0]

1FFh

MICDET Clamp (Falling) Write Sequence

start index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with MICDET Clamp (Falling) detection.

Valid from 0 to 507 (1FBh).

Table 122 Write Sequencer Control - MICDET Clamp

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