SH7708 Datasheet, PDF (340/633 Pages) Renesas Technology Corp – SuperH™ RISC engine

12.1.4 RTC Register Configuration
Table 12.2 shows the RTC register configuration.
Table 12.2 RTC Registers
Name
Abbreviation R/W Initial Value
64-Hz counter
R64CNT
R
Undefined
Second counter
RSECCNT R/W Undefined
Minute counter
RMINCNT R/W Undefined
Hour counter
RHRCNT
R/W Undefined
Day of week counter
RWKCNT
R/W Undefined
Date counter
RDAYCNT R/W Undefined
Month counter
RMONCNT R/W Undefined
Year counter
RYRCNT
R/W Undefined
Second alarm register
RSECAR
R/W Undefined*
Minute alarm register
RMINAR
R/W Undefined*
Hour alarm register
RHRAR
R/W Undefined*
Day of week alarm register RWKAR
R/W Undefined*
Date alarm register
RDAYAR
R/W Undefined*
Month alarm register
RMONAR R/W Undefined*
RTC control register 1
RCR1
R/W H'00
RTC control register 2
RCR2
R/W H'09
Note: Only the ENB bits of each register are initialized.
Address
H'FFFFFEC0
H'FFFFFEC2
H'FFFFFEC4
H'FFFFFEC6
H'FFFFFEC8
H'FFFFFECA
H'FFFFFECC
H'FFFFFECE
H'FFFFFED0
H'FFFFFED2
H'FFFFFED4
H'FFFFFED6
H'FFFFFED8
H'FFFFFEDA
H'FFFFFEDC
H'FFFFFEDE
Access Size
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
12.2 RTC Registers
12.2.1 64-Hz Counter (R64CNT)
The 64-Hz counter (R64CNT) is an 8-bit read-only register that indicates the status of the RTC
divider circuit between 64 Hz and 1 Hz.
R64CNT is reset to H'00 by setting the RESET bit in RTC control register 2 (RCR2) or the ADJ
bit in RCR2 to 1.
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