W78L051C24DL 데이터 시트보기 (PDF) - Winbond

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W78L051C24DL

8-BIT MICROCONTROLLER

Winbond 

W78LE51C/W78L051C

WIDL

IDLE

OSC

1/12

ENW

EXTERNAL

RESET

PRESCALER

14-BIT TIMER

CLEAR

INTERNAL

RESET

Watchdog Timer Block Diagram

CLRW

Typical Watch-Dog time-out period when OSC = 20 MHz

PS2 PS1 PS0

00 0

01 0

00 1

01 1

10 0

10 1

11 0

11 1

WATCHDOG TIME-OUT PERIOD

19.66 mS

39.32 mS

78.64 mS

157.28 mS

314.57mS

629.14 mS

1.25 S

2.50 S

Clock

The W78L051C is designed to be used with either a crystal oscillator or an external clock. Internally,

the clock is divided by two before it is used. This makes the W78L051C relatively insensitive to duty

cycle variations in the clock. The W78L051C incorporates a built-in crystal oscillator. To make the

oscillator work, a crystal must be connected across pins XTAL1 and XTAL2. In addition, a load

capacitor must be connected from each pin to ground. An external clock source should be connected

to pin XTAL1. Pin XTAL2 should be left unconnected. The XTAL1 input is a CMOS-type input, as

required by the crystal oscillator.

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