HD6432138SW datasheet(72/1061 Pages) RENESAS

72 / 1061 page

Section 1 Overview

Rev. 4.00 Jun 06, 2006 page 18 of 1004

REJ09B0301-0400

1.3.3

Pin Functions

Table 1.4 summarizes the functions of the H8S/2138 Group and H8S/2134 Group pins.

Table 1.4

Pin Functions

Pin No.

Type

Symbol

FP-80A

TFP-80C

I/O

Name and Function

Power

supply

VCC1,

VCC2

8*, 47

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 25, Electrical Characteristics.

VSS

12, 56, 73

Input

Ground: For connection to the power supply (0 V).

All VSS pins should be connected to the system

power supply (0 V).

Clock

XTAL

Input

Connected to a crystal oscillator. See section 23,

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 23,

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.

HD6432138SW Datasheet(PDF) 72 Page - Renesas Technology Corp

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