Sony CXD5602 User Manual page 172

RCOSC
Calibration
required to 8MHz
RTC_CLK_IN(32.768kHz)
CKSEL_ROOT.PMU_STAT_CLK_SEL4[1]
SYSIOP_CKEN.SYSIOP_RTC
3.6.3 Function List
Table RTC-62 shows list of functions that this block holds.
No Function Name
1 RTC Counter Update/Synchronization
2 Alarm Output
3.6.4 Function Block Diagrams
Figure RTC-37 is a block diagram that shows functional specification of this block. There are one Time Counter
and three Alarm Timers. Registers are set via APB IF block. APB IF block is operated by PWD_SYSIOP power
supply. RTC0 can select one Alarm from three Alarms, and output it from CXD5602 RTC_IRQ_OUT terminal.
Update function of Time Counter (Time Update) is shown in the block diagram on the next page.
Divider
0
1/250
RTC Clock
1
Figure RTC-36 Clock Resources of RTC
Table RTC-62 Function List
Description
updates internal RTC counter in variety of conditions
outputs Alarm Flag at the prescribed time
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CXD5602 User Manual
RTC0
PWD_CORE
PWD_SYSIOP
CK RTC1
GA TE
APB IF
CK_APB