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Section 14 Realtime Clock
R01UH0134EJ0400 Rev. 4.00 Page 677 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
14.2 Input/Output Pin
Table 14.1 shows the pin configuration.
Table 14.1 Pin Configuration
Pin Name Symbol I/O Description
Realtime clock resonator
crystal pin/
external clock
RTC_X1 Input Connects 32.768-kHz crystal resonator
for this module, and enables to input
the external clock to the RTC_X1 pin.
RTC_X2 Output
Internal clock resonator
crystal/
external clock
EXTAL Input Connects crystal resonator used for
internal operation.
For details, see section 5, Clock Pulse
Generator.
XTAL Output
14.3 Register Descriptions
Table 14.2 shows the register configuration.
Table 14.2 Register Configuration
Register Name Abbreviation R/W Initial Value Address
Access
Size
64-Hz counter R64CNT R H'xx H'FFFE6000 8
Second counter RSECCNT R/W H'xx H'FFFE6002 8
Minute counter RMINCNT R/W H'xx H'FFFE6004 8
Hour counter RHRCNT R/W H'xx H'FFFE6006 8
Day of week counter RWKCNT R/W H'xx H'FFFE6008 8
Date counter RDAYCNT R/W H'xx H'FFFE600A 8
Month counter RMONCNT R/W H'xx H'FFFE600C 8
Year counter RYRCNT R/W H'xxxx H'FFFE600E 16
Second alarm register RSECAR R/W H'xx H'FFFE6010 8
Minute alarm register RMINAR R/W H'xx H'FFFE6012 8
Hour alarm register RHRAR R/W H'xx H'FFFE6014 8
Day of week alarm register RWKAR R/W H'xx H'FFFE6016 8