The external interrupts of 8051 can be enabled by1 pointpriority registerInterrupt enablenone of these4 LSBs of TCON register

The external interrupts of 8051 can be enabled by the 4 LSBs of the TCON register. Here's a step-by-step explanation:

1. The 8051 microcontroller has a special function register (SFR) called TCON (Timer Control Register), which is used to configure the timers and external interrupts.

2. The TCON register is an 8-bit register. The 4 least significant bits (LSBs) of this register are used to enable or disable the external interrupts.

3. Specifically, the 0th and 2nd bits of the TCON register are used to enable or disable the external interrupt 0 (INT0) and external interrupt 1 (INT1) respectively.

4. The 1st and 3rd bits of the TCON register are used to configure the type of the external interrupts (level/edge triggered).

5. So, by setting or clearing these bits, we can enable or disable the external interrupts of the 8051 microcontroller.