SH7124 datasheet(31/782 Pages) RENESAS

31 / 782 page

Section 1

Overview

Rev. 3.00

Sep. 27, 2007

Page 11 of 758

REJ09B0243-0300

1.4

Pin Functions

Table 1.2 summarizes the pin functions.

Table 1.2

Pin Functions

Classification

Symbol

I/O

Name

Function

Vcc

Power supply

Power supply pin

Connect all Vcc pins to the system.

There will be no operation if any pins

are open.

Vss

Ground

Ground pin

Connect all Vss pins to the system

power supply (0V). There will be no

operation if any pins are open.

Power supply

VCL

Power supply for

internal power-

down

External capacitance pins for internal

power-down power supply

Connect these pins to Vss via a 0.1

to 0.47

µF capacitor (placed close to

the pins).

PLLVss

PLL ground

Ground pin for the on-chip PLL

oscillator

EXTAL

External clock

Connected to a crystal resonator.

An external clock signal may also be

input to the EXTAL pin.

Clock

XTAL

Crystal

Connected to a crystal resonator.

MD1

Mode set

Sets the operating mode. Do not

change values on this pin during

operation.

Operating mode

control

FWE

Flash memory

write enable

Pin for flash memory

Flash memory can be protected

against programming or erasure

through this pin.

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