Abstract:
The paper describes the hardware structure of the interface used by a logic analyzer for testing development systems equipped with AT89C51 family microcontroller. The interface is connected to a command and control unit equipped with I80C51 microcontroller and to a personal computer. The command program perform execution and testing functions for instructions run on a tested system, instruction display functions at instruction cycle, semicycle, state, phase and clock levels, initialisation function for the tested microcontroller, as well as other general purpose functions.