PC912XDP512F0MPVR datasheet(613/1348 Pages) FREESCALE

613 / 1348 page

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

613

Chapter 17

Memory Mapping Control (S12XMMCV2)

17.1

Introduction

This section describes the functionality of the module mapping control (MMC) sub-block of the S12X

platform. The block diagram of the MMC is shown in Figure 1-1.

The MMC module controls the multi-master priority accesses, the selection of internal resources and

external space. Internal buses including internal memories and peripherals are controlled in this module.

The local address space for each master is translated to a global memory space.

17.1.1

Features

The main features of this block are:

•

Paging capability to support a global 8 Mbytes memory address space

•

Bus arbitration between the masters CPU, BDM, and XGATE

•

Simultaneous accesses to different resources1 (internal, external, and peripherals) (see Figure 1-1)

•

Resolution of target bus access collision

•

Access restriction control from masters to some targets (e.g., RAM write access protection for user

speciﬁed areas)

•

MCU operation mode control

•

MCU security control

•

Separate memory map schemes for each master CPU, BDM, and XGATE

•

ROM control bits to enable the on-chip FLASH or ROM selection

•

Port replacement registers access control

•

Generation of system reset when CPU accesses an unimplemented address (i.e., an address which

does not belong to any of the on-chip modules) in single-chip modes

17.1.2

Modes of Operation

This subsection lists and brieﬂy describes all operating modes supported by the MMC.

17.1.2.1

Power Saving Modes

•

Run mode

MMC is functional during normal run mode.

1. Resources are also called targets.

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