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I2C
Table of content
The 8039 Assembler file i2c.src is an bitbanging Proof of Concept for an i2C-bus by the MC1000 PCB.
The Mainboard has some DIP-Switches (German: "Mäuseklavier") for multiple purposes.\
Two of them (S1 and S2) are only for binary pattern, recognized by an SN74145 BCD-to-Decimal Decoder.
The decoder will be addressed by P10-P13 (74145 Pin A-D) from the uC 8039 and the output (0-11) will be recognized the condition of connectors within of SW1 and SW2 by the uC 8039 pin T1. A closed switch will be seen as LOW and an open switch will be seen as a HIGH.
For the Proof of Concept SW1 will be used for the Adress and SW2 for the data, wich are send by the I2C routine.
See the SALEAE logicdata files for the Assembler file within the MC1000_I2C repository.
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MC1000 with Intel 8039