I 2 C Port; Figure 3-1. Serial Control Port Internal Block Diagram - Cirrus Logic CS485 Series User Manual

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3.2.1 I C Port
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The CS485xx I C bus has been developed for 8-bit digital control applications, such as those requiring
microcontrollers. The I
transmission and reception with software-addressable external devices. Each external device interfaced to
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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
Control Port is provided in
SCP_IRQ
SCP_BSY
I2C Control /
Clocking
SCP_CLK
EN
SCP_SDA
EN
DS734UM7
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C bus interface is a bidirectional serial port that uses 2 lines (data and clock) for data
Figure 3-1.
MSB (Byte 3) Byte2
MSB (Byte 3) Byte2
7 6 5 4 3 2 1 0
LSB (Byte 0) Byte1
LSB (Byte 0) Byte1

Figure 3-1. Serial Control Port Internal Block Diagram

Copyright 2009 Cirrus Logic, Inc.
Internal Bus
Byte 1 LSB (Byte 0)
Byte 1 LSB (Byte 0)
Byte 2 MSB (Byte 3)
Byte 2 MSB (Byte 3)
Serial Control Port Configuration
CS485xx Hardware User's Manual
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C Serial
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