SH7261 datasheet(673/1348 Pages) RENESAS

673 / 1348 page

Section 15 Realtime Clock (RTC)

Rev. 2.00 Sep. 07, 2007 Page 641 of 1312

REJ09B0320-0200

15.2

Input/Output Pin

Table 15.1 shows the RTC pin configuration.

Table 15.1

Pin Configuration

Name

Abbreviation

I/O

Description

RTC oscillator crystal pin

RTC_X1

Input

Connects 32.768-kHz crystal resonator

for RTC

RTC oscillator crystal pin

RTC_X2

Output

Connects 32.768-kHz crystal resonator

for RTC

15.3

The RTC has the following registers.

Table 15.2

Abbreviation

R/W

Initial Value

Address

Access

Size

64-Hz counter

R64CNT

H'xx

H'FFFE0800

Second counter

RSECCNT

R/W

H'xx

H'FFFE0802

Minute counter

RMINCNT

R/W

H'xx

H'FFFE0804

Hour counter

RHRCNT

R/W

H'xx

H'FFFE0806

Day of week counter

RWKCNT

R/W

H'0x

H'FFFE0808

Date counter

RDAYCNT

R/W

H'xx

H'FFFE080A

Month counter

RMONCNT

R/W

H'xx

H'FFFE080C

Year counter

RYRCNT

R/W

H'xxxx

H'FFFE080E

Second alarm register

RSECAR

R/W

H'xx

H'FFFE0810

Minute alarm register

RMINAR

R/W

H'xx

H'FFFE0812

Hour alarm register

RHRAR

R/W

H'xx

H'FFFE0814

Day of week alarm register

RWKAR

R/W

H'0x

H'FFFE0816

Date alarm register

RDAYAR

R/W

H'xx

H'FFFE0818

Month alarm register

RMONAR

R/W

H'xx

H'FFFE081A

Year alarm register

RYRAR

R/W

H'xxxx

H'FFFE0820

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