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主控stc8h1k28，附原理图。定时器1中断内执行按键扫描，定时器0中断内执行按键服务，定时器2做串口2的波特率发生器，字符串收发程序使用stc-isp范例。生成hex文件时警告如下*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: _KEY_SERVICE
MODULE: .\Objects\main.obj (MAIN)
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: TIMER0_INIT
MODULE: .\Objects\main.obj (MAIN)
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: TIMER1_INIT
MODULE: .\Objects\main.obj (MAIN)
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: KEY_SCAN
MODULE: .\Objects\main.obj (MAIN)
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: UART2_INIT
MODULE: .\Objects\main.obj (MAIN)
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: _UART2SENDSTR
MODULE: .\Objects\main.obj (MAIN)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: KEY_SCAN
MODULE: .\Objects\main.obj (MAIN)
ADDRESS: 0901H
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: _KEY_SERVICE
MODULE: .\Objects\main.obj (MAIN)
ADDRESS: 08BEH
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: UART2_INIT
MODULE: .\Objects\main.obj (MAIN)
ADDRESS: 097CH
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: TIMER0_INIT
MODULE: .\Objects\main.obj (MAIN)
ADDRESS: 097FH
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: TIMER1_INIT
MODULE: .\Objects\main.obj (MAIN)
ADDRESS: 0982H
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: _UART2SENDSTR
MODULE: .\Objects\main.obj (MAIN)
ADDRESS: 099BH
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