PIC18F-LF1XK50 MICROCHIP [Microchip Technology], PIC18F-LF1XK50 Datasheet - Page 274

• Manufacturer Part Number: PIC18F-LF1XK50
• Description: 20-Pin USB Flash Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F/LF1XK50
22.7
The USB module has specific clock requirements. For
full-speed operation, the clock source must be 48 MHz.
Even so, the microcontroller core and other peripherals
are not required to run at that clock speed. Available
clocking options are described in detail in
“USB
22.8
The PIC18F/LF1XK50 has interrupt-on-change func-
tionality on both D+ and D- data pins. This feature
allows the device to detect voltage level changes
when first connected to a USB host/hub.
The USB host/hub has 15K pull-down resistors on the D+
and D- pins. When the PIC18F/LF1XK50 attaches to the
bus the D+ and D- pins can detect voltage changes.
External resistors are needed for each pin to maintain a
high state on the pins when detached.
TABLE 22-4:
DS41350E-page 274
INTCON
IPR2
PIR2
PIE2
UCON
UCFG
USTAT
UADDR
UFRML
UFRMH
UIR
UIE
UEIR
UEIE
UEP0
UEP1
UEP2
UEP3
UEP4
UEP5
UEP6
UEP7
Legend:
Note 1:
Name
Operation”.
Oscillator
Interrupt-On-Change for D+/D-
pins
— = unimplemented, read as ‘0’. Shaded cells are not used by the USB module.
This table includes only those hardware mapped SFRs located in Bank 15 of the data memory space. The Buffer
Descriptor registers, which are mapped into Bank 4 and are not true SFRs, are listed separately in
GIE/GIEH
OSCFIP
OSCFIF
OSCFIE
UTEYE
BTSEE
BTSEF
FRM7
Bit 7
—
—
—
—
—
—
—
—
—
—
—
—
—
—
REGISTERS ASSOCIATED WITH USB MODULE OPERATION
PEIE/GIEL
PPBRST
ENDP3
ADDR6
SOFIE
SOFIF
FRM6
C1IP
C1IE
Bit 6
C1IF
—
—
—
—
—
—
—
—
—
—
—
—
STALLIF
STALLIE
TMR0IE
ENDP2
ADDR5
FRM5
C2IP
C2IE
Bit 5
C2IF
SE0
—
—
—
—
—
—
—
—
—
—
—
—
Section 2.11
EPHSHK
EPHSHK
EPHSHK
EPHSHK
EPHSHK
EPHSHK
EPHSHK
EPHSHK
PKTDIS
UPUEN
ENDP1
ADDR4
BTOEF
BTOEE
INT0IE
IDLEIF
IDLEIE
FRM4
EEIP
EEIF
EEIE
Bit 4
Preliminary
—
EPCONDIS EPOUTEN
EPCONDIS EPOUTEN
EPCONDIS EPOUTEN
EPCONDIS EPOUTEN
EPCONDIS EPOUTEN
EPCONDIS EPOUTEN
EPCONDIS EPOUTEN
EPCONDIS EPOUTEN
DFN8EF
DFN8EE
BCL1IP
BCL1IE
USBEN
BCL1IF
ENDP0
ADDR3
RABIE
TRNIE
TRNIF
FRM3
Bit 3
The USB module must be disable (USBEN = 0) for the
interrupt-on-change to function. Enabling the USB
module (USBEN = 1) will automatically disable the
interrupt-on-change for D+ and D- pins. Refer to
Section 7.11
rupt-on-Change”
22.9
Microchip provides a number of application-specific
resources, such as USB firmware and driver support.
Refer to www.microchip.com for the latest firmware and
driver support.
—
—
CRC16EE
CRC16EF
RESUME
USB Firmware and Drivers
TMR0IF
ACTVIF
ACTVIE
ADDR2
FRM10
USBIP
USBIF
USBIE
FSEN
FRM2
Bit 2
DIR
“PORTA
for mode detail.
SUSPND
CRC5EF
CRC5EE
TMR3IP
TMR3IE
UERRIF
UERRIE
EPINEN
EPINEN
EPINEN
EPINEN
EPINEN
EPINEN
EPINEN
EPINEN
TMR3IF
ADDR1
INT0IF
FRM1
FRM9
PPB1
PPBI
Bit 1
 2010 Microchip Technology Inc.
(1)
and
EPSTALL
EPSTALL
EPSTALL
EPSTALL
EPSTALL
EPSTALL
EPSTALL
EPSTALL
URSTIF
URSTIE
ADDR0
PIDEE
RABIF
PIDEF
FRM0
FRM8
PPB0
Bit 0
Table
—
—
—
—
—
PORTB
22-3.
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