Sony CXD5602 User Manual page 171

3.6.2 Clock Input
The clock source of the RTC is selected from either a real time clock (32.768 kHz) provided by an RTC IC
outside CXD5602 or real time clock from an internal clock (about 32 kHz) divided from the RCOSC. Initial value
after the reset release is "0" (see Table 3.6-1). When you use RCOSC, you must calibrate it to 8.192 MHz by
using API, and then use it for the RTC.
Clock Selection
CKSEL_ROOT.
PMU_STAT_CLK_SEL4[1]
0
1
RTC Clock, which is connected to RTC1 and APB IF (RTC0/1 register control) block, can be provided or stopped
providing by Clock Enable. Provide RTC1 and register with RTC Clock before controlling them.
Clock Enable
SYSIOP_CKEN.SYSIOP_RTC
0
1
Table RTC-60Clock Resource of RTC
Explanation
Clock resource is RCOSC.
The RCOSC is calibrated to 8.192 MHz for use.
Frequency is about 32 kHz.
(initial value after the reset release of CXD5602)
Clock resource is real time clock provided from RTC_CLK_IN
terminal.
Frequency is 32.768 kHz
Table RTC-61 Clock Enable of RTC
Explanation
stops RTC Clock
provides with RTC Clock
(initial value after the reset release of CXD5602)
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CXD5602 User Manual