1. XTAL1 XTAL2 is connected to a parallel resonant clock circuit consisting of two capacitors and a crystal oscillator.
C1, C2 are 30pF, crystal oscillator is 1.2-12MHz, when designing, the crystal oscillator capacitors should be as close as possible to the C51 microcontroller to ensure stability and reliability.
2. Or use an external oscillator to connect to XTAL2, XTAL1 to ground. Note: If XTAL1 is not grounded, the Electrical Rule Check will give the following error:
ELECTRICAL RULES CHECK REPORT
=============================
Design: D:\proteus-design\yx-design\IO-1. DSN
Doc. no.:
Revision:
Author:
Created: 07/02/06
Modified: 07/02/06
UNDRIVEN: U1,XTAL1 (Input)
Netlist generated OK.
ERC errors found.
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