1 i2c port, C port, The cs485xx i – Cirrus Logic CS485xx User Manual
Page 34: C serial control port is provided in figure 3-1
Serial Control Port Configuration
CS485xx Hardware User’s Manual
DS734UM7
Copyright 2009 Cirrus Logic, Inc.
3-2
3.2.1 I
2
C Port
The CS485xx I
2
C bus has been developed for 8-bit digital control applications, such as those requiring
microcontrollers. The I
2
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
2
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
2
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 1
Byte2
MSB (Byte 3)
LSB (Byte 0)
Byte 1
Byte2
MSB (Byte 3)
MSB (Byte 3)
Byte 2
Byte1
LSB (Byte 0)
MSB (Byte 3)
Byte 2
Byte1
LSB (Byte 0)
7
6
5
4
3
2
1
0
Internal Bus
SCP_SDA
SCP_CLK
EN
EN