- Category:
- SCM
- Tags:
-
[ASM]
[源码]
- File Size:
- 34kb
- Update:
- 2013-10-17
- Downloads:
- 0 Times
- Uploaded by:
- Smriti
Description: The I² C-I/O-Expander is an example for easily providing input and output ports for the I² C bus. The I² C circuit PCF8574 provides 8 bidirectional port pins. A LED (LD1-LD8) is connected to each port pin, which is activated with a LOW signal at the corresponding port pin. Furthermore a DIP switch (S1-1 - S1-8) is connected to each ort pin. At opened switch, the PCF8574 reads a HIGH signal, at closed switch it reads a LOW signal, but therefore it is necessary to set the corresponding port pins of the PCF8574 to a HIGH signal via I² C bus. The position of the switch is also shown via a LED, it is activated at closed switch.
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i2c_io.brd
i2c_io.bin
i2c_io.asm
i2c_io.sch
readme.txt
i2c_io_top.gif
i2c_io.gif
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