CS48L32 datasheet(87/192 Pages) CIRRUS

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DS1219F4

Cirrus Logic

CS48L32

4.5 DSP Peripheral Control

The alarm can generate an output via a GPIO pin to provide an external indication of the alarm events. When the alarm

output is triggered, the respective GPIO output is asserted for a duration that is configured using ALM1_CHx_PULSE_

DUR. See Section 4.10 to configure a GPIO pin for this function.

4.5.2.3

Alarm Control Registers

The alarm control registers are described in Table 4-31.

Table 4-31. Alarm (ALMn) Control

Bit

Label

Default

Description

Alarm 1 Base Address = R1130496 (0x114000)

base address

ALMn_TIMER

0ALMn_TIMER_SRC

Alarm block ALMn timer source select

0 = Timer 1

1 = Timer 2

All ALMn channels must be disabled when updating this register.

base address + 0x20

ALMn_CONFIG1

4ALMn_CH1_CONT

Channel 1 continuous mode select

0 = Single mode

1 = Continuous mode

Channel 1 must be disabled (ALMn_CH1_STS = 0) when updating this

field.

1:0

ALMn_CH1_TRIG_

MODE[1:0]

Channel 1 trigger mode select

00 = Absolute Mode: Alarm is triggered when the count value of the timer

source is equal to ALMn_CH1_TRIG_VAL.

01 = Relative Mode: Alarm is triggered when the count value has

incremented by a number equal to ALMn_CH1_TRIG_VAL.

10 = Combination Mode: Alarm is initially triggered as described for

Absolute Mode; the alarm then operates as described for Relative Mode.

11 = Reserved

Channel 1 must be disabled (ALMn_CH1_STS = 0) when updating this

field.

base address + 0x24

ALMn_CTRL1

ALMn_CH1_UPD

Channel 1 update control—Write 1 to indicate a new trigger value or pulse

duration is ready to be applied.

If Channel 1 is enabled and ALMn_CH1_UPD is set, the ALMn_CH1_

TRIG_VAL and ALMn_CH1_PULSE_DUR settings are updated when the

alarm is next triggered or by writing 1 to ALMn_CH1_START.

If Channel 1 is disabled, the ALMn_CH1_UPD bit has no effect, and the

ALMn_CH1_TRIG_VAL and ALMn_CH1_PULSE_DUR settings are

updated immediately when writing to the respective fields.

4ALMn_CH1_STOP

—

Channel 1 stop control—Write 1 to disable Channel 1

0ALMn_CH1_START

—

Channel 1 start control—Write 1 to enable or restart Channel 1

base address + 0x28

ALMn_TRIG_VAL1

31:0 ALMn_CH1_TRIG_

VAL[31:0]

0x0000_

0000

Channel 1 alarm trigger value

base address + 0x2C

ALMn_PULSE_DUR1

31:0 ALMn_CH1_

PULSE_DUR[31:0]

0x0000_

0000

Channel 1 alarm output pulse duration

Configures the duration of the GPIO alarm output indication. The pulse

duration is referenced to the count rate of the selected timer source.

base address + 0x30

ALMn_STATUS1

0ALMn_CH1_STS

Channel 1 status

0 = Disabled

1 = Enabled

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