How to improve the performance of central processing unit in serial communication

摘要

The present invention relates to a method for minimizing the time of an occupied central processing unit for outputting a status / error message through a serial port when a program is executed in a real-time environment. Conventionally, a polling mode There is a problem that the central processing unit can not perform another task and must be in a standby state in order to output the next message due to the difference between the speed of the central processing unit and the speed of the device. / When the status message is output When the message output is completed by using the interrupt without using the polling mode, the interrupt signal indicating that the next message can be output through the interrupt mode of the Z 85 × 30 chip is activated so that the central processing unit performs the original operation So you can allocate time.