5.3 Choosing the development mode Setting a developing mode is necessary so that MPLAB can know what tools will be used to execute the written program. In our case, we need to set up the simulator as a tool that's being used. By clicking on OPTIONS---> DEVELOPMENT MODE, a new window will appear as in the picture below: Setting a developing mode We should select the 'MPLAB-SIM Simulator' option because that is where the program will be tried out. Beside this option, the 'Editor Only' option is also available. This option is used only if we want to write a program and using a programmer write' hex file' in a microcontroller. Selection of the microcontroller model is done on the right hand side. Since this book is based on the PIC16F84, this model should be selected. Ordinarily when we start working with microcontrollers, we use a simulator. As the level of knowledge increases, program can be written in a microcontroller right after translation. Our advice is that you always use the simulator. Though program will seem to develop slower, it will pay off in the end.