CS47L85 datasheet(256/370 Pages) CIRRUS

256 / 370 page

CS47L85

256

Rev 4.3

EVENT LOGGER FIFO BUFFER STATUS OUTPUT

GPn_FN = 150h, 151h, 152h, 153h, 154h, 155h, 156h, 157h.

The Event Loggers are each provided with a 16-stage FIFO buffer, in which any detected events (signal transitions) are

recorded. Status outputs for each FIFO buffer

are provided. See “DSP Peripheral Control” for details of the Event Loggers.

A logic signal from the Event Loggers may be output directly on a GPIO pin by setting the respective GPIO registers as

described in “GPIO Control”. This logic signal is set high whenever the ‘FIFO Not Empty’ condition is true.

The Event Loggers also provide inputs to the Interrupt control circuit. An interrupt event is triggered whenever the respective

FIFO condition occurs. The associated interrupt bits are latched once set; they can be polled at any time or used to control

the IRQ signal. See “Interrupts” for more details of the Interrupt event handling.

GENERAL PURPOSE SWITCH

The CS47L85 provides a General Purpose Switch, which can be used as a controllable analogue switch for external

functions. The switch is implemented between the GPSWP and GPSWN pins. Note that this feature is entirely independent

to the GPIOn pins.

The General Purpose Switch is configured using SW1_MODE. This register allows the switch to be disabled, enabled, or

synchronised to the MICDET Clamp status, as described in Table 99.

The switch is a bi-

directional analogue switch, offering flexibility in the potential circuit applications. Refer to the “Absolute

Maximum Ratings

” and “Electrical Characteristics” for further details.

The switch can be used in conjunction with the MICDET Clamp function, in order suppress pops and clicks associated with

jack insertion and removal. An example circuit is shown in Figure 69

, within the “External Accessory Detection” section. Note

that the MICDET Clamp function must also be configured appropriately when using this method of pop suppression control.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R712

(02C8h)

GP_Switch_

1:0

SW1_MODE [1:0]

General Purpose Switch control

00 = Disabled (open)

01 = Enabled (closed)

10 = Enabled when MICDET Clamp is

active

11 = Enabled when MICDET Clamp is

not active

Table 99 General Purpose Switch control

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