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Interrupts UM018809-0611

ZNEO

CPU Core

User Manual

Returning From a Vectored Interrupt

If no interrupts are pending or the Chained Interrupt Enable Flag (CIRQE) is 0, executing

the Interrupt Return (IRET) instruction at the end of an interrupt service routine results in

the following operations:

1. Pop PC[31:24] from the stack.

2. Pop PC[23:16] from the stack.

3. Pop PC[15:8] from the stack.

4. Pop PC[7:0] from the stack.

5. Increment SP by 1 (so SP alignment is not changed).

Figure 11. Interrupt Vectoring Example

Memory

Interrupt Vector Quad

Interrupt

Vector

Table

Interrupt Service

Routine First

Vector[23:16] = 23H

Vector[15:8] = 45H

0023_4567H

0000_0014H

0000_0015H

Vector[7:0] = 67H

0000_0016H

0000_0017H

Vector[31:24] = 00H

Quad Base Address

Address

Instruction

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 215 216

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