PIC16C765 Microchip Technology Inc., PIC16C765 Datasheet - Page 65

• Manufacturer Part Number: PIC16C765
• Description: 8-bit Cmos Microcontrollers With Usb
• Manufacturer: Microchip Technology Inc.

10.5.1.6
The control register provides various control and con-
figuration information for the USB.
REGISTER 10-6: USB CONTROL REGISTER (UCTRL: 195h)
2000 Microchip Technology Inc.
bit7
bit 7-6: Unimplemented: Read as ’0’
bit 5:
bit 4
bit 3:
bit 2:
bit 1:
bit 0:
U-0
—
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.
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.
generally be set in response to a UIDLE interrupt. It will generally be reset after an ACTIVITY interrupt.
V
driven, however the transceiver outputs are disabled.
USB Control Register (UCTRL)
SE0: Live Single Ended Zero
This status bit indicates that the D+ and D- lines are both pulled to low.
1 = Single ended zero being received
0 = Single ended zero not being received
PKT_DIS: The PKT_DIS bit informs the MCU that the SIE has disabled packet transmission and recep-
DEV_ATT: Device Attach
Enables the 3.3V output.
1 = When DEV_ATT is set, the V
0 = The V
RESUME: Setting this bit will allow the USB to execute resume signaling. This will allow the USB to
1 = Perform RESUME signaling
0 = Normal operation
SUSPND: Suspends USB operation and clocks and places the module in low power mode. This bit will
1 = USB module in power conserve mode
0 = USB module normal operation
Unimplemented: Read as ’0’
USB
U-0
—
regulation will be different between suspend and non-suspend modes. The V
USB
R-X
SE0
pins (D+ and D-) will be in a high impedance state
PKT_DIS DEV_ATT RESUME SUSPND
R/C-0
USB
R/W-0
pin will be driven with 3.3V (nominal)
Preliminary
R/W-0
R/W-0
PIC16C745/765
U-0
—
bit0
R = Readable bit
W = Writable bit
C = Clearable bit
U = Unimplemented bit,
-n = Value at POR reset
X = Don’t care
read as ‘0’
USB
DS41124C-page 65
pin will still be