WM8321 datasheet(106/253 Pages) WOLFSON

106 / 253 page

WM8321

Production Data

PD, February 2012, Rev 4.0

106

20.3 RTC INTERRUPTS

The Real Time Clock (RTC) is associated with two Interrupt event flags.

The RTC_PER_EINT interrupt is set each time a periodic timeout occurs. The periodic timeout is

configured using the RTC_PINT_FREQ field described in Table 51.

The RTC_ALM_EINT interrupt is set when the RTC Alarm is triggered. The RTC Alarm time is

configured as described in Section 20.2.

Each of these secondary interrupts triggers a primary Real Time Clock Interrupt, RTC_INT (see

Section 23). This can be masked by setting the mask bit(s) as described in Table 50.

ADDRESS

BIT

LABEL

DESCRIPTION

R16401

(4011h)

Interrupt Status

RTC_PER_EINT

RTC Periodic interrupt

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

RTC_ALM_EINT

RTC Alarm interrupt

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

R16409

(4019h)

Interrupt Status

1 Mask

IM_RTC_PER_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

IM_RTC_ALM_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

Table 50 Real Time Clock (RTC) Interrupts

The frequency of the RTC periodic interrupts is set by the RTC_PINT_FREQ field, as described in

Table 51.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16421

(4025h)

RTC Control

6:4

RTC_PINT_FREQ

[2:0]

000

RTC Periodic Interrupt timeout period

000 = Disabled

001 = 2s

010 = 4s

011 = 8s

100 = 16s

101 = 32s

110 = 64s

111 = 128s

Table 51 Real Time Clock (RTC) Periodic Interrupt Control

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