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To allow external interrupt 0 interrupt, set EA bit and ex0 bit of interrupt allow register ie to 1.答案:
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The meaning of instruction JNB TF0, LP is: if the timer T0 is not full, turn to LP.
If the timer / counter T1 of 8051 is set in timing mode and working in mode 2, the working mode word is 20h.
If the timer / counter T1 of 8051 is set in counting mode and working in mode 1, the working mode word is 50h.
When the t0 full count of 8051 timer becomes 0, the overflow flag bit (TF0 of TCON) also becomes 0.
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