MCS51 Controller Library 1.DS1307.h // For DS1307 with i2c Bus 2.I2C51.h // For i2c bus 3.lcd4bit.h // For LCD4bit 4.lcd8bit.h // For LCD8bit 5.MCP3208.h // For MCP3208 with SPI Bus 6.PWM.h // For Internal MCS51 PWM Mode 7.Serial.h