PC912XDP512F0MPVR datasheet(596/1348 Pages) FREESCALE

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Chapter 16 Interrupt (S12XINTV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

596

Freescale Semiconductor

16.1.1

Glossary

The following terms and abbreviations are used in the document.

16.1.2

Features

•

Interrupt vector base register (IVBR)

•

One spurious interrupt vector (at address vector base1 + 0x0010).

•

2–113 I bit maskable interrupt vector requests (at addresses vector base + 0x0012–0x00F2).

•

Each I bit maskable interrupt request has a conﬁgurable priority level and can be conﬁgured to be

handled by either the CPU or the XGATE module2.

•

I bit maskable interrupts can be nested, depending on their priority levels.

•

One X bit maskable interrupt vector request (at address vector base + 0x00F4).

•

One non-maskable software interrupt request (SWI) or background debug mode vector request (at

address vector base + 0x00F6).

•

One non-maskable unimplemented opcode trap (TRAP) vector (at address vector base + 0x00F8).

•

Three system reset vectors (at addresses 0xFFFA–0xFFFE).

•

Determines the highest priority DMA and interrupt vector requests, drives the vector to the XGATE

module or to the bus on CPU request, respectively.

•

Wakes up the system from stop or wait mode when an appropriate interrupt request occurs or

whenever XIRQ is asserted, even if X interrupt is masked.

•

XGATE can wake up and execute code, even with the CPU remaining in stop or wait mode.

16.1.3

Modes of Operation

•

Run mode

This is the basic mode of operation.

Table 16-1. Terminology

Term

Meaning

CCR

Condition Code Register (in the S12X CPU)

DMA

Direct Memory Access

INT

Interrupt

IPL

Interrupt Processing Level

ISR

Interrupt Service Routine

MCU

Micro-Controller Unit

XGATE

please refer to the "XGATE Block Guide"

IRQ

refers to the interrupt request associated with the IRQ pin

XIRQ

refers to the interrupt request associated with the XIRQ pin

1. The vector base is a 16-bit address which is accumulated from the contents of the interrupt vector base register (IVBR, used

as upper byte) and 0x00 (used as lower byte).

2. The IRQ interrupt can only be handled by the CPU

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