we r doing a battery simulator using PWM control in 8051.here we sense the load current by resistor-op amp circuit.we fed it to the ADC ,interfaced with 8051. we vary the Pulse width of according to the current value and output voltage is changed(a decrease) finally.

the problem is :

how to match the current sensing and A/D conversion delay while sensing the ADC(0808) value?

( we use only one channel in the ADC0808.)