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I/O Buffer Information Specification (IBIS) models for AT91SAM7SE512/256 in LQFP pacakge with VDDIO at 3.3V.

4位7段数码管电子钟C语言源文件，使用ICC开发，单片机为ATmega8，详细接口定义见注释-4-digit 7-segment digital tube digital clock C language source files, use the ICC development of SCM as ATmega8, detailed interface definitions, see note

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