MC9S12NE64CPVE Datasheet, PDF (67/554 Pages) Freescale Semiconductor, Inc – MC9S12NE64 Device Overview

Chapter 2
64 Kbyte Flash Module (S12FTS64KV3)
2.1 Introduction
This document describes the FTS64K module that includes a 64Kbyte 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.
2.1.1 Glossary
Command Write Sequence — A three-step MCU instruction sequence to execute built-in algorithms
(including program and erase) on the Flash memory.
2.1.2 Features
• 64 Kbytes of Flash memory comprised of one 64 Kbyte block divided into 128 sectors of 512 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
• Security feature to prevent unauthorized access to the Flash memory
• Code integrity check using built-in data compression
2.1.3 Modes of Operation
Program, erase, erase verify, and data compress operations (please refer to Section 2.4.1 for details).
MC9S12NE64 Data Sheet, Rev. 1.1
Freescale Semiconductor
67