
PIC32MX1XX/2XX
DS61168D-page 122
Preliminary
2011-2012 Microchip Technology Inc.
FIGURE 10-1:
PIC32MX1XX/2XX FAMILY USB INTERFACE DIAGRAM
OSC1
OSC2
Primary Oscillator
8MHz Typical
FRC
Oscillator
TUN<5:0>(3)
PLL
48 MHz USB Clock(6)
Div x
UPLLEN(5)
UFRCEN(2)
(POSC)
UPLLIDIV(5)
UFIN(4)
Div 2
VUSB3V3
D+(1)
D-(1)
ID(7)
Bus
Transceiver
SIE
VBUSON(7)
Comparators
USB
SRP Charge
SRP Discharge
Registers
and
Control
Interface
Transceiver Power 3.3V
USB Module
Voltage
System
RAM
Full Speed Pull-up
Host Pull-down
Low Speed Pull-up
Host Pull-down
ID Pull-up
DMA
Note 1:
Pins can be used as digital inputs when USB is not enabled.
2:
This bit field is contained in the OSCCON register.
3:
This bit field is contained in the OSCTRM register.
4:
USB PLL UFIN requirements: 4 MHz.
5:
This bit field is contained in the DEVCFG2 register.
6:
A 48 MHz clock is required for proper USB operation.
7:
Pins can be used as GPIO when the USB module is disabled.