51 MCU interrupt number and the working mode of timer

Interrupt number                         interrupt 0 External interrupt 0 (EX0)                        interrupt 1         Timer /timer interrupt 0 (ET0)                        interrupt 2 External interrupt 1 (EX1)                        interrupt 3 Timer/timer interrupt 1 (ET1)                        interrupt 4 Serial port interrupt (ES )                                          Timer working mode  1. Mode 0                     consists of 8 bits of TH0 and the lower 5 bits of TL0 to form a 13-bit timer.                     When the 13-bit timer is from 0 or the set value, after adding 1 to all '1', adding 1 will cause                     overflow. At this time, the TF0 bit of TCON is set to 1, and the timer is initialized to all '0' at the same time   . 2. Mode 1                     Mode 1 and Mode 0 work the same, the only difference is that TH0 and TL0 form a 16-bit counter.                     The reset method is the same as that of method 0.  3. Method 2










 

 










            Configure TL0 as an 8-bit timer that can automatically restore the initial value (the initial constant is automatically reloaded)
                     , TH0 is used as a constant buffer, and TH0 is preset by software. When TL0 overflows, on the one hand, the
                    overflow flag is set. 1. At the same time, reload the 8-bit data in TH0 into TL0.
                              Mode 2 is often used for timing control. For example, if you want to generate a timing control pulse every 250us,
                    you can use a 12MHz oscillator, preset TH0 to 6, and make C/=0 to achieve it. Mode 2
                   is not used as a serial port. baud rate generator. 
 4. Mode 3
            Mode 3 is different for timer T0 and timer T1.
            If T1 is set to mode 3, it will stop working (the effect is the same as TR1=0),
            so mode 3 is only applicable to T0