Power-On Self Testing of Communication Interface
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
A method of testing the error detection function of power on initial function test program is applicable to machines connected on data transmission lines, such as terminal unit that employs a USART (universal synchronous/asynchronous receiver/transmitter) circuit module. Machines having an MPU (microprocessor unit) usually have programs that test functions of the machines themselves. POST (power on self- test) is invoked by power-on reset (POR) signal and performs test functions after fetching a first instruction from ROM (read-only memory), then testing MPU, ROS (read-only storage), RAM (random-access memory), video interface, etc.