These five routines are very important in 51 single-chip microcontrollers, including digital-to-analog conversion, serial communication, IIC bus, quadruple quadruple matrix keyboard and microcontroller interrupt system. Proficient in the use of these functions in the future embedded in the development of a great help.

IIC总线的EEPROM
...............\AT24C02
...............\AT24C02.hex
...............\AT24C02.lnp
...............\AT24C02.LST
...............\AT24C02.M51
...............\AT24C02.OBJ
...............\AT24C02.Opt
...............\AT24C02.plg
...............\AT24C02.Uv2
...............\AT24C02_Opt.Bak
...............\AT24C02_Uv2.Bak
...............\EEPROM_AT24C02.c
...............\EEPROM_AT24C02.LST
...............\EEPROM_AT24C02.OBJ
UART1串口通信
.............\UART1
.............\UART1.c
.............\UART1.hex
.............\UART1.lnp
.............\UART1.LST
.............\UART1.M51
.............\UART1.OBJ
.............\UART1.Opt
.............\UART1.plg
.............\UART1.Uv2
.............\UART1_Opt.Bak
.............\UART1_Uv2.Bak
数模转换（ADDA）
................\main.c
................\main.LST
................\main.OBJ
................\main_2.c
................\main_2.LST
................\main_2.OBJ
................\PCF8591
................\PCF8591.hex
................\PCF8591.lnp
................\PCF8591.M51
................\PCF8591.Opt
................\PCF8591.plg
................\PCF8591.Uv2
................\PCF8591_Opt.Bak
................\PCF8591_Uv2.Bak
四乘四矩阵键盘
..............\KeyScan
..............\KeyScan.c
..............\KeyScan.hex
..............\KeyScan.lnp
..............\KeyScan.LST
..............\KeyScan.M51
..............\KeyScan.OBJ
..............\KeyScan.Opt
..............\KeyScan.plg
..............\KeyScan.Uv2
..............\KeyScan_Opt.Bak
..............\KeyScan_Uv2.Bak
中断系统
........\interrupt
........\interrupt.c
........\interrupt.hex
........\interrupt.lnp
........\interrupt.LST
........\interrupt.M51
........\interrupt.OBJ
........\interrupt.Opt
........\interrupt.plg
........\interrupt.Uv2
........\interrupt_Opt.Bak
........\interrupt_Uv2.Bak

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