AN1385 STMicroelectronics, AN1385 Datasheet

AN1385

Manufacturer Part Number

AN1385

Description

PSD913F2 - 68HC11 DESIGN GUIDE

Manufacturer

STMicroelectronics

Datasheet

1.AN1385.pdf (35 pages)

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CONTENTS

August 2001

PHYSICAL

CONNECTIONS

FIRST DESIGN EXAMPLE

- IAP with NO MEMORY

PAGING

– Memory Map

– PSDsoft Express Design

SECOND DESIGN

EXAMPLE - IAP with

MEMORY PAGING

– Memory Map

– PSDsoft Express Design

THIRD DESIGN EXAMPLE

- ADVANCED IAP with

PAGING & SWAPPING

– Memory Map

CONCLUSION

REFERENCES

Entry

Easy FLASH™ PSD9XXF devices are members of a family of

flash-based peripherals for use with embedded microcontrol-

lers (MCUs). These Programmable System Devices (PSDs)

consist of memory, logic, and I/O. When coupled with a low-

cost, ROM-less 68HC11 MCU, the PSD forms a complete em-

bedded Flash system that is 100% In-System-Programmable

(ISP). There are many features in the PSD silicon and in the

PSDsoft Express development software that make ISP easy for

you, regardless of how much experience you have in embed-

ded flash design.

This document offers three Flash 68HC11 designs using a

PSD913F2 device. The first is a simple system to get up and

running quickly for basic applications, or to check out your pro-

totype 68HC11 hardware. The second design illustrates the

use memory paging. The third covers enhanced features of

PSD In-System-Programming, including memory paging and

segment swapping. You can start with the first design, and mi-

grate to the second and third as your functional requirements

grow. There are other members of the PSD9XXF family, in-

cluding the PSD913F1 and the PSD934F2. The PSD913F1

contains some EEPROM, and the PSD934F2 has a larger

Flash Memory and a larger SRAM than the PSD913F2. See

the PSD9XXF data sheet for details. This application note is

applicable to these other PSD9XXF family members, with only

slight variations.

In-System Programming and In-Application

re-Programming

Our industry uses the term In-System Programming, or ISP, in

a general sense. ISP is applicable to programmable logic, as

well as programmable Non-Volatile Memory (NVM). However,

an additional term will be used in this document: In-Application

re-Programming (IAP). There are subtle yet significant differ-

ences between ISP and IAP when microcontrollers are in-

volved. ISP of memory means that the MCU is off line and not

involved while memory is being programmed. IAP of memory

means that the MCU participates in programming memory,

which is important for systems that must be online while updat-

ing firmware. Often, ISP is well suited for manufacturing, while

IAP is appropriate for field updates. PSD9XXF devices provide

both ISP and IAP for your system. Keep in mind that IAP can

only program the memory sections of the PSD, not the config-

PSD913F2 / 68HC11 Design Guide

APPLICATION NOTE

AN1385

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