PIC16C765SLASHP datasheet(65/158 Pages) MICROCHIP

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Advanced Information

DS41124A-page 65

PIC16C745/765

10.5.1.6

USB Control Register (UCTRL)

The control register provides various control and con-

figuration information for the USB.

USB CONTROL REGISTER (UCTRL: 195h)

U-0

R-X

R/C-0

R/W-0

U-0

—

SE0

PKT_DIS Config_Bit RESUME

SUSPND

—

R = Readable bit

W = Writable bit

C = Clearable bit

U = Unimplemented bit,

read as ‘0’

-n = Value at POR reset

X = Don’t care

bit7

bit0

bit 7-6:

Unimplemented: Read as ’0’.

bit 5:

SE0: Live Single Ended Zero. This status bit indicates that the D+ and D- lines are both pulled to low.

= single ended zero being received

= single ended zero not being received

bit 4

PKT_DIS: The PKT_DIS bit informs the MCU that the SIE has disabled packet transmission and recep-

tion. Clearing this bit allows the SIE to continue token processing. This bit is set by the SIE when a Setup

Token is received allowing software to dequeue any pending packet transactions in the BDT before resum-

ing token processing. The PKT_DIS bit is set under certain conditions such as back to back SETUP

tokens. This bit is not set on every SETUP token and can be modified only when UCTRL.SUSPND = 0.

bit 3:

Config_Bit: Configuration bit used by firmware during enumeration.

bit 2:

RESUME: Setting this bit will allow the USB to execute resume signaling. This will allow the USB to per-

form remote wake-up. Software must set RESUME to 1 for 10 mS then clear it to 0 to enable remote wake-

up. For more information on RESUME signaling, see Section 7.1.7.5, 11.9 and 11.4.4 in the USB 1.1 spec-

ification.

= perform Resume signaling

= normal operation

bit 1:

SUSPND: Suspends USB operation and clocks and places the module in low power mode. This bit will

generally be set in response to a UIDLE interrupt. It will generally be reset after an ACTIVITY interrupt.

The VUSB pin will still be driven, however the transceiver outputs are disabled.

= USB module in power conserve mode

= USB module normal operation

bit 0:

Unimplemented: Read as ’0’.

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