HD6432147SW datasheet(70/1177 Pages) RENESAS

70 / 1177 page

Section 1 Overview

Rev. 4.00 Sep 27, 2006 page 26 of 1130

REJ09B0327-0400

1.3.3

Pin Functions

Table 1.3 summarizes the pin functions of this LSI.

Table 1.3

Pin Functions

Pin No.

Type

Symbol

FP-100B

TFP-100B

I/O

Name and Function

Power

supply

VCC1

VCC2

4 [H8S/2144

Group only],

Input

Power supply: For connection to the power supply.

All VCC1 and VCC2* pins should be connected to

the system power supply.

VCL

Input

Internal step-down voltage pin: A power supply

pin for the product, applicable to product lines that

have an internal step-down voltage. In the 5-V and

4-V versions, connect external capacitors to

stabilize the internal step-down voltage between

this pin and the VSS pin. Do not connect it to Vcc.

In the 3-V version, connect this pin and the VCC1

pin to the power supply for the system. For details,

See section 26, Electrical Characteristics.

VCCB

4 [H8S/2148

Group and

H8S/2147N

only]

Input

Input/output buffer power supply: Power supply

pin for the port A input/output buffer.

VSS

15, 70

71, 92

Input

Ground: All VSS pins should be connected to the

system power supply (0 V).

Clock

XTAL

Input

Connected to a crystal oscillator. See section 24,

Clock Pulse Generator, for typical connection

diagrams for a crystal oscillator and external clock

input.

EXTAL

Input

Connected to a crystal oscillator. The EXTAL pin

can also input an external clock. See section 24,

Clock Pulse Generator, for typical connection

diagrams for a crystal oscillator and external clock

input.

Output System clock: Supplies the system clock to

external devices.

EXCL

Input

External subclock input: Input a 32.768 kHz

external subclock.

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