SH7243 datasheet(43/1726 Pages) RENESAS

43 / 1726 page

Section 1 Overview

Rev. 1.00 Jun. 26, 2008 Page 13 of 1692

REJ09B0393-0100

1.4

Pin Functions

Table 1.2 lists functions of each pin.

Table 1.2

Pin Functions

Classification

Symbol

I/O

Name

Function

VCC

Input

Power supply

Power supply pins. All the VCC pins

must be connected to the system

power supply. This LSI does not

operate correctly if there is a pin left

open.

VSS

Input

Ground

Ground pins. All the VSS pins must be

connected to the system power supply

(0 V). This LSI does not operate

correctly if there is a pin left open.

VCL

Input

Internal step-

down power

supply

External capacitance pins for internal

step-down power supply. All the VCL

pins must be connected to VSS via a

0.47-

µF capacitor (should be placed

close to the pins).

Power supply

PLLVSS

Input

Ground for PLL Ground pin for the on-chip PLL

oscillator.

EXTAL

Input

External clock

Connected to a crystal resonator.

An external clock signal may also be

input to the EXTAL pin.

XTAL

Output Crystal

Connected to a crystal resonator.

USBEXTAL Input

Crystal for USB Connected to a resonator for the USB.

USBXTAL

Output Crystal for USB Connected to a resonator for the USB.

Clock

Output System clock

Supplies the system clock to external

devices.

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