Filter
Top Products
PicoBlaze 8-bit Embedded Microcontroller www.xilinx.com 97
UG129 (v1.1.2) June 24, 2008
DISABLE INTERRUPT — Disable External Interrupt Input
R
DISABLE INTERRUPT — Disable External Interrupt Input
The DISABLE INTERRUPT instruction clears the interrupt enable (IE) flag. Consequently,
the PicoBlaze microcontroller ignores the INTERRUPT input. Use this instruction to
temporarily disable interrupts during timing-critical code segments. Use the ENABLE
INTERRUPT instruction to re-enable interrupts.
Example
DISABLE INTERRUPT; Disable interrupts
Pseudocode
INTERRUPT_ENABLE Å 0
PC Å PC + 1
Registers/Flags Altered
Registers: PC
Flags: INTERRUPT_ENABLE
Notes
PBlazIDE Equivalent: DINT
ENABLE INTERRUPT — Enable External Interrupt Input
The ENABLE INTERRUPT instruction sets the interrupt enable (IE) flag. Consequently, the
PicoBlaze microcontroller recognizes the INTERRUPT input. Before using this instruction,
a suitable interrupt service routine (ISR) must be associated with the interrupt vector
address, 3FF.
Never issue the ENABLE INTERRUPT instruction from within an ISR.
Example
ENABLE INTERRUPT; Enable interrupts
Pseudocode
INTERRUPT_ENABLE Å 1
PC Å PC + 1
Registers/Flags Altered
Registers: PC
Flags: INTERRUPT_ENABLE
Notes
PBlazIDE Equivalent: EINT