SH7713 datasheet(547/904 Pages) RENESAS

547 / 904 page

Section 15 Realtime Clock (RTC)

Rev.1.50 Aug. 30, 2006 Page 507 of 860

REJ09B0288-0150

15.2

Input/Output Pins

Table 15.1 shows the RTC pin configuration.

Table 15.1

Pin Configuration

Pin Name

Abbreviation I/O

Function

RTC external clock

EXTAL2

Connects crystal to RTC oscillator*

RTC crystal

XTAL2

Connects crystal to RTC oscillator*

RTC oscillator power supply

VccQ-RTC

—

Dedicated power-supply pin for RTC*

RTC oscillator ground

VssQ-RTC

—

Dedicated GND pin for RTC

Note:

1. Pull up (VccQ-RTC) the EXTAL2 pin, and open (NC) the XTAL2 pin when the realtime

clock (RTC) is not used.

2. RTC in this LSI does not operate even if VccQ-RTC is turned on. The crystal oscillator

circuit for RTC operates with VccQ-RTC. The control circuit and the RTC counter

operate with Vcc (common to the internal circuit). Therefore, all power supplies other

than VccQ-RTC should always be turned on even if only RTC operates.

15.3

The RTC has the following registers. Refer to section 23, List of Registers, for more details on the

address and access size.

• 64-Hz counter (R64CNT)

• Second counter (RSECCNT)

• Minute counter (RMINCNT)

• Hour counter (RHRCNT)

• Day of week counter (RWKCNT)

• Date counter (RDAYCNT)

• Month counter (RMONCNT)

• Year counter (RYRCNT)

• Second alarm register (RSECAR)

• Minute alarm register (RMINAR)

• Hour alarm register (RHRAR)

• Day of week alarm register (RWKAR)

• Date alarm register (RDAYAR)

• Month alarm register (RMONAR)

• Year alarm register (RYRAR)

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