DV164126 Microchip Technology, DV164126 Datasheet - Page 32

• Manufacturer Part Number: DV164126
• Description: KIT DEVELOPMENT USB W/PICKIT 2
• Manufacturer: Microchip Technology

Specifications of DV164126

• Main Purpose: Interface, USB 2.0 Slave
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: PIC18F13K50, PIC18F14K50
• Primary Attributes: Full Speed (12Mbps), MCU Based
• Secondary Attributes: 4 Labs: Enumeration, HID Mouse, HID Keyboard, CDC Serial Emulator
• Silicon Manufacturer: Microchip
• Silicon Core Number: PIC18F14K50, PIC18F13K50
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Family Name: Piccolo
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Low Pin Count USB Development Kit User’s Guide
PROJECT LAB 4 (CDC – SERIAL EMULATOR)
DS41356A-page 28
In this lab, the PIC18F14K50 is used as a serial emulator taking an RS-232 data trans-
mission using the Enhanced Universal Asynchronous Synchronous Receiver Transmit-
ter (EUSART) peripheral and converting it to the USB protocol within firmware. Many
embedded applications continue to use the RS-232 interface to communicate with
external systems. However, as USB becomes more prevalent, RS-232 ports are disap-
pearing from newer PC’s. A simple solution is to emulate RS-232 over the USB. In this
example, a Virtual COM Port is created that will allow the USB connection to appear as
an RS-232 COM connection. Furthermore, this example makes use of Windows drivers
that already exist eliminating the need to alter existing software such as the Hyper
Terminal application.
Microchip’s Full-Speed USB Firmware Framework provides information files (.inf) for all
of its CDC application examples that automate Windows driver alterations freeing the
user from doing this manually. Once the PIC18F14K50 has been programmed and
then connected to the PC USB port, Windows “New Hardware Found Wizard” will
prompt the user for additional driver information. At this point, the user need only direct
Windows to the directory containing the appropriate .inf file.
Microchip’s Full-Speed USB Firmware Framework provides all the source code
necessary to perform low-level RS-232 functions, thereby abstracting this from the
user.
Overview of the CDC – Serial Emulator Firmware
The CDC Serial Emulator firmware flow is shown in Figure 2-5.
Note:
Note:
The only information that is required by the user in the .inf is the Vendor
Identification (VID) and Product Identification (PID) numbers specific to
their original design.
The user will be required to supply an RS-232 serial cable. Also, the CDC
– Serial Emulator lab requires the use of a Gender Changer to connect the
female DB9 connector on the Low Pin Count USB Kit to the female-type
connector found on all RS-232 connected PCs. In normal usage, the Low
Pin Count USB Development Kit is designed to serve as an intermediary
between a USB-connected PC and an RS-232 peripheral – such as an
alarm panel or a remote control.
© 2008 Microchip Technology Inc.