Microchip Technology ADM00419 Data Sheet
2011 Microchip Technology Inc.
DS22288A-page 29
MCP2210
3.1.8
GET USB KEY PARAMETERS
3.1.8.1
Responses
FIGURE 3-8:
GET USB KEY PARAMETERS LOGIC FLOW
TABLE 3-21:
COMMAND STRUCTURE
Byte
Index
Meaning
0
0x61 – Get NVRAM Settings – command code
1
0x30 – Get USB Key Parameters – sub-command code
2
0x00 – Reserved
3-63
0x00 – Reserved
TABLE 3-22:
RESPONSE 1 STRUCTURE
Byte
Index
Meaning
0
0x61 – Get NVRAM Settings – echos back the given command code
1
0x00 – Command Completed Successfully
2
0x30 – Sub-command Echoed Back for Get USB Key Parameters code
3-11
Don’t care
12
VID low byte
13
VID high byte
14
PID low byte
15
PID high byte
16-28
Don’t care
29
Chip Power Option (as per USB specs – Chapter 9)
• Bit 7 – Host Powered
• Bit 6 – Self Powered
• Bit 5 – Remote Wake-up Capable
• Bit 4 – Don’t Care
• Bit 3 – Don’t Care
• Bit 2 – Don’t Care
• Bit 1 – Don’t Care
• Bit 0 – Don’t Care
• Bit 7 – Host Powered
• Bit 6 – Self Powered
• Bit 5 – Remote Wake-up Capable
• Bit 4 – Don’t Care
• Bit 3 – Don’t Care
• Bit 2 – Don’t Care
• Bit 1 – Don’t Care
• Bit 0 – Don’t Care
30
Requested Current Amount from USB Host (quanta of 2 mA)
Example: For 100 mA this byte index will have a value of 50 (in decimal) or 0x32.
31-63
Don’t Care
Get NVRAM USB
Key Parameters
Response 1
NVRAM USB
Key Parameters
Retrieved