WM8352 datasheet(195/336 Pages) WOLFSON

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WM8352

PD, February 2011, Rev 4.4

195

22.5 RTC INTERRUPTS

The RTC has its own first-level interrupt, RTC_INT (see Section 24). This comprises three second-

level interrupts which indicate periodic events or RTC Alarm conditions.

The RTC raises an RTC_SEC_EINT interrupt on every 1 second rollover. An additional periodic

interrupt, RTC_PER_EINT, is configurable with a frequency determined by the RTC_PINT field, as

defined in Table 138. The RTC_ALM_EINT interrupt is triggered by the RTC Alarm function, as

described in Section 22.2.4.

These interrupts can be individually masked by setting the applicable mask bit(s) as described in

Table 137.

ADDRESS

BIT

LABEL

DESCRIPTION

R25 (19h)

Interrupt Status

RTC_PER_EINT

RTC periodic interrupt.

(Rising Edge triggered)

Note: This bit is cleared once read.

RTC_SEC_EINT

RTC 1s rollover complete (1Hz tick).

(Rising Edge triggered)

Note: This bit is cleared once read.

RTC_ALM_EINT

RTC alarm signalled.

(Rising Edge triggered)

Note: This bit is cleared once read.

R33 (21h)

Interrupt Status

1 Mask

7:5

“IM_” + name of respective

bit in R25

Each bit in R33 enables or masks the

corresponding bit in R25. The default

value for these bits is 0 (unmasked).

Table 137 RTC Interrupts

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R23 (17h)

RTC Time

control

6:4

RTC_PINT

[2:0]

010

Selects frequency of periodic interrupt output

pulse (32kHz period duration) as shown below.

When set time status is high, the periodic

output is disabled.

000 = disabled

001 = 1 sec

010 = 1 min

011 = 1 hour

100 = 1 day

101 = 1 month

11x = disabled

Table 138 Configuring RTC Periodic Interrupts

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