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Serial Control Port Configuration

CS485xx Hardware User’s Manual

3.2.1 I

C Port

The CS485xx I

C bus has been developed for 8-bit digital control applications, such as those requiring

microcontrollers. The I

C bus interface is a bidirectional serial port that uses 2 lines (data and clock) for data

transmission and reception with software-addressable external devices. Each external device interfaced to

the CS485xx I

C port has the ability to communicate directly with the other devices and is assigned a unique

address whether it is a CPU, memory, or some other device. A block diagram of the CS485xx I

C Serial

Control Port is provided in Figure 3-1.

Figure 3-1. Serial Control Port Internal Block Diagram

I2C Control /

Clocking

SCP_BSY

SCP_IRQ

LSB (Byte 0)Byte 1Byte2MSB (Byte 3)

MSB (Byte 3)Byte 2Byte1LSB (Byte 0)

7 6 5 4 3 2 1 0

Internal Bus

SCP_SDA

SCP_CLK

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 101 102

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