Datasheet
PIC32MZ Embedded Connectivity with Floating Point Unit (EF) Family
DS60001320B-page 244 Preliminary 2015 Microchip Technology Inc.
bit 16
LPMXMT: LPM Transition to the L1 State bit
When in
Device mode:
1 = USB module will transition to the L1 state upon the receipt of the next LPM transaction. LPMEN must
be set to ‘0b11. Both LPMXMT and LPMEN must be set in the same cycle.
0 = Maintain current state
When LPMXMT and LPMEN are set, the USB module can respond in the following ways:
• If no data is pending (all TX FIFOs are empty), the USB module will respond with an ACK. The bit will
self clear and a software interrupt will be generated.
• If data is pending (data resides in at least one TX FIFO), the USB module will respond with a NYET. In
this case, the bit will not self clear however a software interrupt will be generated.
When in
Host mode:
1 = USB module will transmit an LPM transaction. This bit is self clearing, and will be immediately cleared
upon receipt of any Token or three time-outs have occurred.
0 = Maintain current state
bit 15-12
ENDPOINT<3:0>: LPM Token Packet Endpoint bits
This is the endpoint in the token packet of the LPM transaction.
bit 11-9
Unimplemented: Read as ‘0’
bit 8
RMTWAK: Remote Wake-up Enable bit
This bit is applied on a temporary basis only and is only applied to the current suspend state.
1 = Remote wake-up is enabled
0 = Remote wake-up is disabled
bit 7-4
HIRD<3:0>: Host Initiated Resume Duration bits
The minimum time the host will drive resume on the bus. The value in this register corresponds to an actual
resume time of:
Resume Time = 50 µs + HIRD * 75 µs. The resulting range is 50 µs to 1200 µs.
bit 3-0
LNKSTATE<3:0>: Link State bits
This value is provided by the host to the peripheral to indicate what state the peripheral must transition to
after the receipt and acceptance of a LPM transaction. The only valid value for this register is ‘1’ for Sleep
State (L1). All other values are reserved.
REGISTER 11-28: USBLPMR1: USB LINK POWER MANAGEMENT CONTROL
REGISTER 1 (CONTINUED)