Frequency meter application with mpf-i/88

The reason of this investigation is to give application as an example which can be done with MPF-I/88 microprocessor system. Device performs cold start when power is first applied. It executes warm start, if a reset sinyal cames while the device is on. There are varius ports at system to input to system and to output from it. Input and output units to be put into define adresses are LCD display, printer, keyboard and tape input/output (I/O). Recording method of MPF-I/88 is similar to IBM-PC. There are logics supporting CPU that provide necessary signals in order to operate the microprocessor and memory map and I/O. Memory decoders are investigated with two manner. They are RAM and ROM decoders. I/O interface logic determines the adresses of I/O ports. An expanding card is used to expand the system. AUTO ROM is used to constitute external instruction and to start the system from specified adress. There are great number of instructions to be constituted at monitor program to write "line assembler" to MPF-I/88. These instructions are explanied the here, theoretically. If you want to see other examples of these instructions, you can apply to user's manuel book. Frequencymeter program is given as an example to 8088's instructions. This Frequencymeter counts per second. As you know 8088 microprocessor is used at this system.8088 CPU has 14 register. There are 20 bit of adress bus. Therefore, adressing for 1MByte can be done, but this is impossible for the SI and DI registers are used at some string processes.