Sys Driver - Freescale Semiconductor DSP56800E User Manual

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SYS Driver

This section describes the API for the MC56F800E on-chip system support functions - system

integration module, low voltage detection and external bus interface. The functionality of these

modules itself is described in the device Data Sheet, MC56F83xx Peripheral User Manual,

56F8000 Peripheral Reference Manual, 56F802x/3x Peripheral Reference Manual and

56F800x Peripheral Reference Manual.

Introduction

The 56F800E devices have a reset circuitry which includes:

Power-On Reset (POR) - keep chip in reset state until supply voltage rises up to a sufficient level

External Reset - external RESET input

COP (Computer Operating Properly) module Reset

SYS driver implements functions which detect the type of the previous Reset.

Beside the reset circuitry the MC56F83xx, MC56F801x and

Voltage Interrupt function (also referred as Power Supervisor or Brown-out detection). This

function can generate an interrupt if the supply voltage drops below 2.2V or 2.7V thus

maintaining reliable chip operation without additional external circuitry.

This section describes the SYS driver software providing the low level software layer interfacing

hardware to/with software.

Quick Reference

This section is intended as a source of quick access information, while the details are discussed in

Section 5.5.3.

Unlike the 56F800 processors where the three system modules were covered by the single

peripheral address space, the 56F800E processors split the functionality into separate modules:

SYS (SIM) - System Integration Module

LVI - Low-Voltage Inhibit Module (Power Supervisor)

SEMI (EMI)- System Bus External Memory Interface

Module base address

SYS (SIM_BASE)

LVI (LVI_BASE)

SEMI (SEMI_BASE)

FREESCALE SEMICONDUCTOR

Table 5-94. Module Base Address

Targeting 56F8xxx Platform

devices have a Low

MC56F802x/3x

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