wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 197
wm8350
Manufacturer Part Number
wm8350
Description
Wolfson Audioplus? Stereo Codec With Power Management
Manufacturer
Wolfson Microelectronics plc
Datasheet
1.WM8350.pdf
(345 pages)
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22.4 RTC GPIO OUTPUT
w
It is possible to configure GPIO6 as an RTC output, as described in Section 20. This output is a
square wave that is derived from the trimmed RTC counter. The frequency can be set to values
between 1Hz and 16.384kHz, as described in Table 135.
Note that, when RTC_TRIM is used to calibrate the crystal oscillator, the nominal 50% duty ratio of
this output may deviate by up to 8 clock periods of the 32.768kHz oscillator on the occasions when
the RTC Seconds Counter is increased (ie. once per second).
R23 (17h)
RTC Time
control
Table 135 RTC GPIO Output
ADDRESS
BIT
3:0
RTC_DSW [3:0]
LABEL
DEFAULT
0000
Divided Square wave select.
0000 = disabled
0001 = 1Hz
0010 = 2Hz
…
1011 = 1024Hz
1100 = 2048Hz
1101 = 4096Hz
1110 = 8192Hz
1111 = 16384Hz
Note: due to trim settings for crystal
intolerances a single square wave period
during seconds rollover may be decrease
its on time period or increase its off time
period by up to 8 32kHz periods.
DESCRIPTION
PD, June 2009, Rev 4.1
WM8350
197
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