USING I2C WITH PICAXE（使用I2C PICAXE）.pdf

USING I2C WITH PICAXE Contents: This article provides an introduction into how to use i2c parts with the PICAXE system. This article: 1) Describes the i2c bus 2) Explains how the i2c bus is used with the PICAXE system 3) Gives an example of using the i2c bus with a 24LCxx series EEPROM 4) Gives an example of using the i2c bus with a DS1307 real time clock. 5) Gives an example of using the i2c bus with a SPE030 speech synthesizer. All the information in this datsheet applies to the PICAXE-X parts (18X, 28X, 40X). If you wish to experiment with use of the i2c bus, we recommend use of the AXE110 Datalogger fitted with the AXE034 Real Time Clock Upgrade. This will provide you with a board that has the PICAXE-18X, a 24LC16B EEPROM memory chip, and a DS1307 real-time-clock chip fitted. Terms used in this article: IC - integrated circuit or ‘chip’ Master - a microcontroller IC that ‘controls’ the operation of a circuit Slave - a slave IC that does certain specialised tasks for the master IC Byte - a number between 0 and 255 Register - a memory location within the slave that stores 1 byte of data Register Address - an address that ‘points’ to a particular memory register Block - group of 256 registers EEPROM IC - a slave IC that can store a large amount of data RTC IC - a slave IC that can maintain the date / time (real-time-clock) ADC IC - a slave IC that can perform analogue-to-digital conversions Sample i2c circuit PICAXE-18X datalogger circuit.