The Nh4602 Oscilloscope Calibrator Control Circuit To Achieve

The project is to upgrade the digital circuit and monitor software for NH4602-the programmable time and amplitude set test model developed by our lab several years ago.The monitor software was fixed in the ram, which is used as data temporary area. I use port a of 8155 as control code outport deviation ,port b as input of deviation, port c as control of input circuit, and 8155 has additional 256 byte ram. I use matrix scan keyboard for user to input their orders and LCD to display ,and the communication port is RS-232.The control circuit consists of MC(J-89c52?8l55r 232port .IT can realize the functions as followed communicate with PC, so that the user can send their control instruction, and can use parser to analysis the instruction into the formatted datas , and send control code to analog circuit. The LCD can display the instructions inputted by user and deviations in real-ume, and user also can use keyboard to input their orders. The communication circuit can also send deviations to the PC in ASCII codeThe MCU I adopted is the latest bpe, it's better than MC6802,and the compile language is C-51 ,it's better than masnx and simple to add new functions on the base of given program.