Hi i am new to pic programming and i am wanting to make a PIC16f84A peak and hold injector driver circuit.
The injectors are .7ohm @ 12volts .7/12=17.14amps this current it too great. it only needs to saturate the injector for 500us and then osilate 5k-10k 50% duty for current limiting.
The Peak and Hold current look like this 17amp for 500us then 8amps
we need to current limit as the injector over heat with 17amp full saturation.

I am using PortA as 4 inputs and PortB as 4 Outputs.
But i need the pic16f84 to trigger the mosfet like this, Peak switch on for 500us then pwm 5k-10k hertz 50% duty for current limiting.
and when the signal is removed from input Port A input the output PortB must switch off and then wait for another input signal. all 4 Inputs and Outputs must be separate from each other.

any help will be much apreciated
thank you
Mark