CS47L35 datasheet(167/300 Pages) CIRRUS

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CS47L35

4.14 General-Purpose I/O

4.14.2 GPIO Function Select

The available GPIO functions are described in Table 4-84. The function of each GPIO is set using GPn_FN, where n

identifies the GPIO pin (1–16). Note that the respective GPn_DIR must also be set according to whether the function is an

input or output.

4.14.3 Pin-Specific Alternative Function—GPn_FN = 0x000

The CS47L35 GPIO capability is multiplexed with the pin-specific functions listed in Table 4-85. The alternate functions

are selected by setting the respective GPn_FN fields to 0x000, as described in Section 4.14.1. Note that each function is

unique to the associated pin and can be supported only on that pin.

If the alternate function is selected on a GPIO pin, the pin direction (input or output) and the output driver configuration

(CMOS or open drain) are set automatically as described in Table 4-85. The respective GPn_DIR and GPn_OP_CFG bits

have no effect in this case.

Table 4-84. GPIO Function Select

GPn_FN

Description

Comments

0x000

Pin-specific alternate function

Alternate functions supporting digital microphone, digital audio interface, master control

interface, and PDM output functions.

0x001

Button-detect input/logic-level

output

GPn_DIR = 0: GPIO pin logic level is set by GPn_LVL.

GPn_DIR = 1: Button detect or logic level input.

0x002

DSP GPIO

Low latency input/output for DSP functions.

0x003

IRQ1 output

Interrupt (IRQ1) output

0 = IRQ1 not asserted

1 = IRQ1 asserted

0x004

IRQ2 output

Interrupt (IRQ2) output

0 = IRQ2 not asserted

1 = IRQ2 asserted

0x010

FLL1 clock

Clock output from FLL1

0x018

FLL1 lock

Indicates FLL1 lock status

0 = Not locked

1 = Locked

0x040

OPCLK clock output

Configurable clock output derived from SYSCLK

0x048

PWM1 output

Configurable PWM output PWM1

0x049

PWM2 output

Configurable PWM output PWM2

0x04C S/PDIF output

IEC-60958-3–compatible S/PDIF output

0x0B6 SPKOUTL short circuit status

SPKOUT short circuit status

0=Normal

1 = Short Circuit detected

0x0E0 Speaker shutdown status

Speaker shutdown status

0=Normal

1 = Speaker shutdown completed (due to overheat temperature, short-circuit protection, or

general-purpose timer condition)

0x0E1 Speaker overheat shutdown

Indicates shutdown temperature status

0 = Temperature is below shutdown level

1 = Temperature is above shutdown level

0x0E2 Speaker overheat warning

Indicates warning temperature status

0 = Temperature is below warning level

1 = Temperature is above warning level

0x140

Timer 1 status

Timer n status

A pulse is output after the respective timer reaches its final count value.

0x141

Timer 2 status

0x142

Timer 3 status

0x143

Timer 4 status

0x150

Event Log 1 FIFO not-empty status Event Log n FIFO Not-Empty status

0=FIFO Empty

1 = FIFO Not Empty

0x151

Event Log 2 FIFO not-empty status

0x152

Event Log 3 FIFO not-empty status

0x153

Event Log 4 FIFO not-empty status

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