PC312XDP512F0CFVR datasheet(1147/1348 Pages) FREESCALE

1147 / 1348 page

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

1149

Chapter 28

256 Kbyte Flash Module (S12XFTX256K2V1)

28.1

Introduction

This document describes the FTX256K2 module that includes a 256 Kbyte Flash (nonvolatile) memory.

The Flash memory may be read as either bytes, aligned words or misaligned words. Read access time is

one bus cycle for bytes and aligned words, and two bus cycles for misaligned words.

The Flash memory is ideal for program and data storage for single-supply applications allowing for ﬁeld

reprogramming without requiring external voltage sources for program or erase. Program and erase

functions are controlled by a command driven interface. The Flash module supports both block erase and

sector erase. An erased bit reads 1 and a programmed bit reads 0. The high voltage required to program

and erase the Flash memory is generated internally. It is not possible to read from a Flash block while it is

being erased or programmed.

CAUTION

A Flash word must be in the erased state before being programmed.

Cumulative programming of bits within a Flash word is not allowed.

28.1.1

Glossary

Command Write Sequence — A three-step MCU instruction sequence to execute built-in algorithms

(including program and erase) on the Flash memory.

Multiple-Input Signature Register (MISR) — A Multiple-Input Signature Register is an output

response analyzer implemented using a linear feedback shift-register (LFSR). A 16-bit MISR is used to

compress data and generate a signature that is particular to the data read from a Flash block.

28.1.2

Features

•

256 Kbytes of Flash memory comprised of two 128 Kbyte blocks with each block divided into 128

sectors of 1024 bytes

•

Automated program and erase algorithm

•

Interrupts on Flash command completion, command buffer empty

•

Fast sector erase and word program operation

•

2-stage command pipeline for faster multi-word program times

•

Sector erase abort feature for critical interrupt response

•

Flexible protection scheme to prevent accidental program or erase

•

Single power supply for all Flash operations including program and erase

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