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Technical Support
On-Line Manuals
MCBx51 User's Guide
Introduction
Setup
Theory of Operation
251 Devices
Writing Programs for 251 Devices
C251 Development Tools
Application Notes
Creating Application Programs
Creating a Project
Setting Target Options
Configuring Output Files
Building a Program
Debugging Programs for 251
Example Programs for 251 devices
BLINKY
Building BLINKY
Debugging BLINKY
Checking Output
Using the External UART
8051 Devices
MCBx51 User's Guide
Using the External UART
The MCBx51 includes an external 16550 UART.
The I/O library (\KEIL\C251\EXAMPLES\MCB251\MCB251C2.LIB) contains routines to transmit and receive serial data using the external UART. The \KEIL\C251\EXAMPLES\MCB251\MCB251C2.UV2 project builds the MCB251C2 library. The ABSTRACT.TXT file in this project folder contains an overview of the functions available.
The library for the MCBx51 board may be used with the Intel 251Sx/Tx and Atmel AT/TSC80251G1D/G2D devices (in Source Mode). You may add the library to your projects to communicate using the EXT RS232 UART of the MCBx51 board. The Hello and Measure example programs in the \KEIL\C251\EXAMPLES\ folder use this library.
You may replace the default run-time library _getkey and putchar routines with those from the MCB251C2.LIB.
- Add the library to your project.
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In the Project Window, right-click on the library and select
Options for File.
-
In the Options Dialog, under Select Modules to Always
Include, make certain that the GETKEY and PUTCHAR
modules are selected. These object modules contain the
_getkey and putchar functions.
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