USB2422
DS00001726B-page 28 2013 - 2015 Microchip Technology Inc.
4.4.13 MAX POWER FOR SELF-POWERED OPERATION REGISTER (MAXPS)
4.4.14 MAX POWER FOR BUS-POWERED OPERATION REGISTER (MAXPB)
4.4.15 HUB CONTROLLER MAX CURRENT FOR SELF-POWERED OPERATION REGISTER
(HCMCS)
Address: 0Ch Size: 8 bits
Bits Description Type Default
7:0 Max Power Self-Powered (MAX_PWR_SP)
Value in 2mA increments that the Hub consumes from an upstream port
(VBUS) when operating as a self-powered hub. This value includes the hub
silicon along with the combined power consumption (from VBUS) of all
associated circuitry on the board. This value also includes the power
consumption of a permanently attached peripheral if the hub is configured as
a compound device, and the embedded peripheral reports 0mA in its
descriptors.
Note: The USB2.0 Specification does not permit this value to exceed
100mA.
R/W 00h
Address: 0Dh Size: 8 bits
Bits Description Type Default
7:0 Max Power Bus-Powered (MAX_PWR_BP)
Value in 2mA increments that the Hub consumes from an upstream port
(VBUS) when operating as a self-powered hub. This value includes the hub
silicon along with the combined power consumption (from VBUS) of all
associated circuitry on the board. This value also includes the power
consumption of a permanently attached peripheral if the hub is configured as
a compound device, and the embedded peripheral reports 0mA in its
descriptors.
R/W 00h
Address: 0Eh Size: 8 bits
Bits Description Type Default
7:0 Hub Controller Max Current Self-Powered (HC_MAX_C_SP)
Value in 2mA increments that the Hub consumes from an upstream port
(VBUS) when operating as a self- powered hub. This value includes the hub
silicon along with the combined power consumption (from VBUS) of all
associated circuitry on the board. This value does NOT include the power
consumption of a permanently attached peripheral if the hub is configured as
a compound device.
Note: The USB2.0 Specification does not permit this value to exceed
100mA.
R/W 00h