(1) External interrupt request source: external interrupts 0 and 1 are introduced through external pins. There are two pins on the microcontroller, named INT0 and INT1, which are P3.2 and P3.3. There are four bits in the internal TCON that are related to external interrupts.
IT0: INT0 trigger mode control bit, which can be set and reset by software. When IT0=0, INT0 is low level trigger mode, and when IT0=1, INT0 is negative transition trigger mode. The difference between these two modes will be discussed later.
IE0: INT0 interrupt request flag. When there is an external interrupt request, this bit will be set to 1 (this is done by hardware). After the CPU responds to the interrupt, the hardware will clear IE0 to 0.
The purpose of IT1 and IE1 is the same as that of IT0 and IE0.
(2) Internal interrupt request source
TF0: overflow interrupt flag of timer T0. When T0 counts and overflows, TF0 is set by hardware. When the CPU responds to the interrupt, TF0 is cleared by hardware.
TF1: Similar to TF0.
TI, RI: serial port send and receive interrupts.
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