SH7708 datasheet(339/633 Pages) RENESAS

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12.1.3

Pin Configuration

Table 12.1 shows the RTC pin configuration.

Table 12.1

RTC Pin Configuration

Abbreviation I/O

Description

RTC oscillator crystal pin

EXTAL2

Connects crystal to RTC oscillator

RTC oscillator crystal pin

XTAL2

Connects crystal to RTC oscillator

Clock input/clock output

TCLK

I/O

External clock input pin/input capture

control input pin/realtime clock (RTC)

output pin (shared by TMU)

Dedicated power-supply pin for RTC Vcc (RTC)

—

Dedicated power-supply pin for RTC*

Dedicated GND pin for RTC

Vss (RTC)

—

Dedicated GND pin for RTC*

Note: * With the SH7708S and SH7708R, except in hardware standby mode, all V

CC and VSS pins

should be connected to the system power supply (power should be supplied constantly). In

hardware standby mode, power should be supplied at least to V

CC (RTC) and VSS (RTC).

power is not supplied to V

CC and VSS pins other than VCC (RTC) and VSS (RTC), hold the CA

pin low. With the SH7708, it is not possible to supply power only to the RTC power supply.

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