PIC18F4550-I/P Microchip Technology Inc., PIC18F4550-I/P Datasheet - Page 165

• Manufacturer Part Number: PIC18F4550-I/P
• Description: 40 PIN, 32 KB FLASH, 2048 RAM, FS-USB 2.0
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F4550-I/P

• A/d Inputs: 13-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 12 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 34
• Interface: I2C/SPI/UART/USART/USB
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 40-pin PDIP
• Programmable Memory: 32K Bytes
• Ram Size: 2K Bytes
• Speed: 48 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

17.0
This section describes the details of the USB
peripheral. Because of the very specific nature of the
module, knowledge of USB is expected. Some
high-level
Section 17.10 “Overview of USB” only for application
design reference. Designers are encouraged to refer to
the official specification published by the USB Imple-
menters Forum (USB-IF) for the latest information.
USB Specification Revision 2.0 is the most current
specification at the time of publication of this document.
17.1
The PIC18FX455/X550 device family contains a
full-speed and low-speed compatible USB Serial Inter-
face Engine (SIE) that allows fast communication
between any USB host and the PIC
FIGURE 17-1:
© 2006 Microchip Technology Inc.
USB Clock from the
Note 1: This signal is only available if the internal transceiver is disabled (UTRDIS = 1).
Oscillator Module
USB Control and
USB RAM
1 Kbyte
Configuration
UNIVERSAL SERIAL BUS
(USB)
Overview of the USB Peripheral
2: The internal pull-up resistors should be disabled (UPUEN = 0) if external pull-up resistors are used.
3: Do not enable the internal regulator when using an external 3.3V supply.
VREGEN
USB
information
USB PERIPHERAL AND OPTIONS
EN
PIC18FX455/X550 Family
3.3V Regulator
UTRDIS
USB
UPUEN
SIE
FSEN
is
®
microcontroller.
provided
Transceiver
Internal Pull-ups
FS
UOE
PIC18F2455/2550/4455/4550
Preliminary
in
P
P
The SIE can be interfaced directly to the USB, utilizing
the internal transceiver, or it can be connected through
an external transceiver. An internal 3.3V regulator is
also available to power the internal transceiver in 5V
applications.
Some special hardware features have been included to
improve performance. Dual port memory in the
device’s data memory space (USB RAM) has been
supplied to share direct memory access between the
microcontroller core and the SIE. Buffer descriptors are
also provided, allowing users to freely program end-
point memory usage within the USB RAM space. A
Streaming Parallel Port has been provided to support
the uninterrupted transfer of large volumes of data,
such as isochronous data, to external memory buffers.
Figure 17-1 presents a general overview of the USB
peripheral and its features.
V
D+
D-
UOE
VM
VP
RCV
VMO
VPO
SPP7:SPP0
CK1SPP
CK2SPP
CSSPP
OESPP
USB
(1)
(1)
Pull-ups
Optional
External
Speed)
(1)
(1)
(1)
(1)
(Full
(2)
Transceiver
External
Speed)
(Low
External 3.3V
Supply
DS39632C-page 163
(3)
USB Bus
USB Bus