MCP2200
1.1
Supported Operating Systems
later)/Vista/7
1.3
UART Interface
Microsoft Windows XP(SP2 and
operating systems are supported.
The MCP2200 UART interface consists of the TX and
RX data signals and the RTS/CTS flow control pins.
The UART is configurable for several baud rates. The
available data formats and baud rates are listed in
1.1.1
ENUMERATION
The MCP2200 will enumerate as a USB device after
POR. The device enumerates as both a Human
Interface Device (HID) for I/O control, and a VCP.
1.3.1
INITIAL CONFIGURATION
1.1.1.1
HID
The MCP2200 enumerates as a HID so the device can
be configured and the I/O can be controlled. A DLL is
supplied by Microchip that allows I/O control using a
custom interface.
The default UART configuration is 19200, 8, N, 1. The
default start up baud rate can be changed using the
Microchip supplied configuration PC tool. The primary
baud rates are shown in
Alternatively, a custom configuration tool can be
created using the Microchip supplied DLL to set the
baud rate, as well as other parameters. See
for details.
1.1.1.2
VCP
The VCP enumeration implements the USB-to-UART
data translation.
1.3.2
GET/SET LINE CODING
1.2
Control Module
The control module is the heart of the MCP2200. All
other modules are tied together and controlled via the
control module. The control module manages the data
transfers between the USB and the UART, as well as
command requests generated by the USB host
controller, and commands for controlling the function of
the UART and I/O.
The
GET_LINE_CODING
and
SET_LINE_CODING
commands are used to read and set the UART
parameters while in operation. For example,
Hyperterminal sends the
SET_LINE_COMMAND
when
connecting to the port. The MCP2200 responds by
setting the baud rate only. The other parameters (Data
Bits, Parity, Stop Bits) remain unchanged.
1.3.2.1
Rounding Errors
1.2.1
SERIAL INTERFACE
The control module interfaces to the UART and USB
modules.
1.2.2
INTERFACING TO THE DEVICE
The primary baud rate setting (with the rounding errors)
are shown in
If baud rates other than the
ones shown in the table are used, the error percentage
can be calculated using
to find the actual
baud rate.
The MCP2200 can be accessed for reading and writing
via USB host commands. The device cannot be
accessed and controlled via the UART interface.
TABLE 1-2:
UART CONFIGURATIONS
Configuration
See
8
N
1
Parameter
Primary Baud Rates
Data Bits
Parity
Stop Bits
1.3.3
CUSTOM BAUD RATES
Custom baud rates are configured by sending the
SET_LINE_CODING USB
command, or by using the
DLL. See
for more
information.
DS22228A-page 4
2010 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
