CS48L32 datasheet(89/192 Pages) CIRRUS

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DS1219F4

Cirrus Logic

CS48L32

4.5 DSP Peripheral Control

4.5.3

General-Purpose Timer

The CS48L32 incorporates two general-purpose timers, which support a wide variety of uses. The general-purpose timers

provide time-stamp data for the event logger; they also provide input to the alarm-generator circuits, enabling

time-dependent interrupt events to be generated.

4.5.3.1

Overview

The timers allow time-stamp information to be associated with external signal detection, and other system events, enabling

real-time data to be more easily integrated into user applications. The timers allow many advanced functions to be

implemented with a high degree of autonomy from a host processor.

The timers can use either internal system clocks, or external clock signals, as a reference. The selected reference is scaled

down, using configurable dividers, to the required clock count frequency.

4.5.3.2

Timer Control

The clock source for the timer is selected using TIMERn_REFCLK_SRC, (where n identifies the applicable timer, 1–2).

base address + 0x6C

ALMn_PULSE_DUR3

31:0 ALMn_CH3_

PULSE_DUR[31:0]

0x0000_

0000

Channel 3 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 + 0x70

ALMn_STATUS3

0ALMn_CH3_STS

Channel 3 status

0 = Disabled

1 = Enabled

base address + 0x80

ALMn_CONFIG4

4ALMn_CH4_CONT

Channel 4 continuous mode select

0 = Single mode

1 = Continuous mode

Channel 4 must be disabled (ALMn_CH4_STS = 0) when updating this

field.

1:0

ALMn_CH4_TRIG_

MODE[1:0]

Channel 4 trigger mode select

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

source is equal to ALMn_CH4_TRIG_VAL.

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

incremented by a number equal to ALMn_CH4_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 4 must be disabled (ALMn_CH4_STS = 0) when updating this

field.

base address + 0x84

ALMn_CTRL4

ALMn_CH4_UPD

Channel 4 update control—Write 1 to indicate a new trigger value or pulse

duration is ready to be applied.

If Channel 4 is enabled and ALMn_CH4_UPD is set, the ALMn_CH4_

TRIG_VAL and ALMn_CH4_PULSE_DUR settings are updated when the

alarm is next triggered or by writing 1 to ALMn_CH4_START.

If Channel 4 is disabled, the ALMn_CH4_UPD bit has no effect, and the

ALMn_CH4_TRIG_VAL and ALMn_CH4_PULSE_DUR settings are

updated immediately when writing to the respective fields.

4ALMn_CH4_STOP

—

Channel 4 stop control—Write 1 to disable Channel 4

0ALMn_CH4_START

—

Channel 4 start control—Write 1 to enable or restart Channel 4

base address + 0x88

ALMn_TRIG_VAL4

31:0 ALMn_CH4_TRIG_

VAL[31:0]

0x0000_

0000

Channel 4 alarm trigger value

base address + 0x8C

ALMn_PULSE_DUR4

31:0 ALMn_CH4_

PULSE_DUR[31:0]

0x0000_

0000

Channel 4 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 + 0x90

ALMn_STATUS4

0ALMn_CH4_STS

Channel 4 status

0 = Disabled

1 = Enabled

Table 4-31. Alarm (ALMn) Control (Cont.)

Bit

Label

Default

Description

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