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Module 2: The 8051 Architecture

20242m

In 8051, which register is used to enable or disable interrupts?
(i) IE
(ii) IP
(iii) TCON
(iv) PCON

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Answer: (i) IE

Explanation: IE = Interrupt Enable register (address A8H) in 8051. Bit EA (IE.7) is the global enable; bits ES, ET1, EX1, ET0, EX0 individually enable/disable serial, Timer1, External1, Timer0, External0 interrupts. IP = Interrupt Priority, TCON controls interrupt flags and timer run, PCON is power control. So IE enables/disables interrupts.

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