SH7708 datasheet(340/633 Pages) RENESAS

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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

Address

Access Size

64-Hz counter

R64CNT

Undefined

H'FFFFFEC0

Second counter

RSECCNT

R/W

Undefined

H'FFFFFEC2

Minute counter

RMINCNT

R/W

Undefined

H'FFFFFEC4

Hour counter

RHRCNT

R/W

Undefined

H'FFFFFEC6

Day of week counter

RWKCNT

R/W

Undefined

H'FFFFFEC8

Date counter

RDAYCNT

R/W

Undefined

H'FFFFFECA

Month counter

RMONCNT

R/W

Undefined

H'FFFFFECC

Year counter

RYRCNT

R/W

Undefined

H'FFFFFECE

Second alarm register

RSECAR

R/W

Undefined*

H'FFFFFED0

Minute alarm register

RMINAR

R/W

Undefined*

H'FFFFFED2

Hour alarm register

RHRAR

R/W

Undefined*

H'FFFFFED4

Day of week alarm register

RWKAR

R/W

Undefined*

H'FFFFFED6

Date alarm register

RDAYAR

R/W

Undefined*

H'FFFFFED8

Month alarm register

RMONAR

R/W

Undefined*

H'FFFFFEDA

RTC control register 1

RCR1

R/W

H'00

H'FFFFFEDC

RTC control register 2

RCR2

R/W

H'09

H'FFFFFEDE

Note:

Only the ENB bits of each register are initialized.

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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