目 录
摘 要 ...........................................................................................................................................I
ABSTRACT ...............................................................................................................................II
1 绪论.........................................................................................................................................1
1.1 数据采集系统及发展历程 ...............................................................................................1
1.2 I2C 总线及优点 ................................................................................................................1
2 系统方案.................................................................................................................................3
2.1 系统方案简介...................................................................................................................3
2.2 系统总体方案的确定.......................................................................................................3
2.2.1 主控制器方案的选型................................................................................................3
2.2.2 I2C 扩展芯片的选型..................................................................................................4
2.2.3 温度传感器的选型....................................................................................................4
2.2.4 LCD 液晶驱动器的选型............................................................................................5
2.2.5 A/D 转换器的选型.....................................................................................................5
2.3 总结 ...................................................................................................................................5
3 P89LPC922 单片机及 I2C 接口 .............................................................................................6
3.1 P89LPC922 单片机概述...................................................................................................6
3.1.1 芯片内部框图............................................................................................................6
3.3.2 引脚配置....................................................................................................................7
3.4 I/O 口 .................................................................................................................................7
3.4.1 I/O 端口配置 ..............................................................................................................8
3.4.2 准双向口输出配置....................................................................................................8
3.4.3 开漏输出配置............................................................................................................8
3.4.4 仅为输入配置............................................................................................................8
3.4.5 推挽输出配置............................................................................................................9
3.5 中断...................................................................................................................................9
3.6 I2C 总线接口 ....................................................................................................................9
3.6.1 概述............................................................................................................................9
3.6.2 I2C 特殊功能寄存器描述........................................................................................10
3.6.3 I2C 操作模式............................................................................................................12
3.7 总结 .................................................................................................................................13
4 硬件电路设计.......................................................................................................................14
4.1 单片机控制电路.............................................................................................................14
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