wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 195

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
22.5 RTC INTERRUPTS
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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 137. 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 136.
R25 (19h)
Interrupt Status
1
R33 (21h)
Interrupt Status
1 Mask
Table 136 RTC Interrupts
R23 (17h)
RTC Time
control
Table 137 Configuring RTC Periodic Interrupts
ADDRESS
ADDRESS
BIT
7:5
BIT
6:4
7
6
5
RTC_PER_EINT
RTC_SEC_EINT
RTC_ALM_EINT
“IM_” + name of respective
bit in R25
RTC_PINT
[2:0]
LABEL
LABEL
DEFAULT
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
RTC periodic interrupt.
(Rising Edge triggered)
Note: This bit is cleared once read.
RTC 1s rollover complete (1Hz tick).
(Rising Edge triggered)
Note: This bit is cleared once read.
RTC alarm signalled.
(Rising Edge triggered)
Note: This bit is cleared once read.
Each bit in R33 enables or masks the
corresponding bit in R25. The default
value for these bits is 0 (unmasked).
DESCRIPTION
DESCRIPTION
PD, June 2009, Rev 4.1
WM8351
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