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USB5533B 数据表(PDF) 38 Page - Microchip Technology

部件名 USB5533B
功能描述  3-Port SS/HS USB Hub Controller
PDF  71 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

USB5533B 数据表(HTML) 38 Page - Microchip Technology

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USB5533B
DS00001680C-page 38
 2012 - 2015 Microchip Technology Inc.
5.6.1.2
Configuration Register Read Example
The following example shows how to read the Charger Detection register to find out what type of charger the hub has
connected to:
1.
Write data to the memory of the hub.
2.
Execute the Configuration Register Access command.
3.
Read back data starting at memory offset 04h, which is where the Data byte starts.
Although the device can send out 128 bytes of memory data, it isn’t necessary to read the entire set, the SMBus Master
can send a stop at any time.
TABLE 5-16:
EXAMPLE SMBUS WRITE COMMAND
Byte
Value
Comment
0
5Ah
Address plus write bit.
1
00h
Memory address 0000h.
2
00h
Memory address 0000h.
3
04h
Number of bytes to write to memory.
4
01h
Read Configuration Register.
5
01h
Reading one data bytes.
6
30h
BC Detect is in register 30E2h.
7
E2h
BC Detect is in register 30E2h.
TABLE 5-17:
CONFIGURATION REGISTER ACCESS COMMAND
Byte
Value
Comment
0
5Ah
Address plus write bit.
1
99h
Command 9937h.
2
37h
Command 9937h.
3
00h
Command Completion.
TABLE 5-18:
EXAMPLE SMBUS READ COMMAND
Byte
Value
Comments
0
5Ah
Address plus Write bit.
1
00h
Memory Address 0004h.
2
04h
Memory Address 0004h.
3
59h
Address plus Read bit.
4
80h
Device sends 128 bytes of data.
5
56h
Charging Downstream Port Detected.



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