PC912XDP512F0MPVR datasheet(183/1348 Pages) FREESCALE

183 / 1348 page

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

183

Chapter 6

XGATE (S12XGATEV2)

6.1

Introduction

The XGATE module is a peripheral co-processor that allows autonomous data transfers between the

MCU’s peripherals and the internal memories. It has a built in RISC core that is able to pre-process the

transferred data and perform complex communication protocols.

The XGATE module is intended to increase the MCU’s data throughput by lowering the S12X_CPU’s

interrupt load.

Figure 6-1 gives an overview on the XGATE architecture.

This document describes the functionality of the XGATE module, including:

•

XGATE registers (Section 6.3, “Memory Map and Register Deﬁnition”)

•

XGATE RISC core (Section 6.4.1, “XGATE RISC Core”)

•

Hardware semaphores (Section 6.4.4, “Semaphores”)

•

Interrupt handling (Section 6.5, “Interrupts”)

•

Debug features (Section 6.6, “Debug Mode”)

•

Security (Section 6.7, “Security”)

•

Instruction set (Section 6.8, “Instruction Set”)

6.1.1

Glossary of Terms

XGATE Request

A service request from a peripheral module which is directed to the XGATE by the S12X_INT

module (see Figure 6-1).

XGATE Channel

The resources in the XGATE module (i.e. Channel ID number, Priority level, Service Request

Vector, Interrupt Flag) which are associated with a particular XGATE Request.

XGATE Channel ID

A 7-bit identiﬁer associated with an XGATE channel. In S12X designs valid Channel IDs range

from $78 to $09.

XGATE Channel Interrupt

An S12X_CPU interrupt that is triggered by a code sequence running on the XGATE module.

XGATE Software Channel

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