C51的XTAL1,XTAL2的外接電源經(jīng)驗

1.XTAL1 XTAL2 外接由兩個(gè)電容與晶振的并聯(lián)諧振時(shí)鐘電路

C1,C2 選30pF,晶振選1.2-12MHz,設計時(shí),當使晶振各電容盡可能的與C51單片機靠近,以保證穩定可靠

2.或用外部振蕩器接至XTAL2,XTAL1接地,注意:XTAL1如果不接地的話(huà),Electrical Rule Check會(huì )給出錯誤如下下:

ELECTRICAL RULES CHECK REPORT
=============================
Design: D:proteus-designyx-designIO-1.DSN
Doc. no.:
Revision:
Author:
Created: 07/02/06
Modified: 07/02/06

UNDRIVEN: U1,XTAL1 (Input)

Netlist generated OK.
ERC errors found.