PIC16C765T-I/L【PDF 128/165 页】IC MCU OTP 8KX14 USB 44PLCC

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2000 Microchip Technology Inc.

Preliminary

DS41124C-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.

REGISTER 10-6:

USB CONTROL REGISTER (UCTRL: 195h)

U-0

R-X

R/C-0

R/W-0

U-0

—

SE0

PKT_DIS

DEV_ATT 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:

DEV_ATT: Device Attach

Enables the 3.3V output.

= When DEV_ATT is set, the VUSB pin will be driven with 3.3V (nominal)

= The VUSB pins (D+ and D-) will be in a high impedance state

bit 2:

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

perform 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

specification.

= 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.

VUSB regulation will be different between suspend and non-suspend modes. 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’

745cov.book Page 65 Wednesday, August 2, 2000 8:24 AM

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