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Chao ban Hatuan296,
Minh khong biet nhieu ve 18F4520, nhung dua theo data sheet thi thay ban can coi lai:
1. ADCON0 = %00010011 cho thay ban chon AN4 la analog input cho cam bien, nhu vay ADCON1 = %00011111 cho thay khong co port A nao cho AN4.
theo thien y cua minh thi nen viet ACDCON0 = %00000011, ADCCON1 = %00011110, TRISA = %11111111 .(minh chon AN0 cho cam bien, AN0 la analog input, con lai la digital input).
2. Khong thay ban nhac den ADCON2( noi ve right, left justify, accquisition time, A/D conversion clock ) minh khong ro DEFINE ADC_CLOCK 3 va DEFINE ADC_SAMPLESUS 50 co the dung cho 18F4520 duoc khong. Neu thu chay duoc, cho minh biet voi.
Day cung la dip de minh hoc ve PIC 18FXXXX.
Chuc ban thanh cong.
Thai Vu
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