The 8051 Microcontroller and Embedded

Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

HANEL

INTERRUPTSEnabling and Disabling an Interrupt

(cont’)

EX0

ET0

EX1

ET1

ES

ET2

--

EA

Enables or disables external interrupt 0

IE.0

EX0

Enables or disables timer 0 overflow interrupt

IE.1

ET0

Enables or disables external interrupt 1

IE.2

EX1

Enables or disables timer 1 overflow interrupt

IE.3

ET1

Enables or disables the serial port interrupt

IE.4

ES

Enables or disables timer 2 overflow or capture interrupt (8952)

IE.5

ET2

Not implemented, reserved for future use

IE.6

--

Disables all interrupts
IE.7
IE (Interrupt Enable) RegisterD7 EA

D0

EA (enable all) must be set to 1 in order for rest of the register to take effect