MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 497

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Chapter 18
64 Kbyte Flash Module (S12FTS64KV4)
18.1
The
array of
The Flash array may be read as either bytes, aligned words, or misaligned words. Read access time is one
bus cycle for byte and aligned word, and two bus cycles for misaligned words.
The Flash array 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 mass erase and
sector erase. An erased bit reads 1 and a programmed bit reads 0. The high voltage required to program
and erase is generated internally. It is not possible to read from a Flash array while it is being erased or
programmed.
18.1.1
Command Write Sequence — A three-step MCU instruction sequence to program, erase, or erase verify
the Flash array memory.
18.1.2
Freescale Semiconductor
•
•
•
•
•
•
•
•
FTS64K
64
Automated program and erase algorithm
Interrupts on Flash command completion and command buffer empty
Fast sector erase and word program operation
2-stage command pipeline for faster multi-word program times
Flexible protection scheme to prevent accidental program or erase
Single power supply for Flash program and erase operations
Security feature to prevent unauthorized access to the Flash array memory
64
Introduction
Kbytes of Flash memory comprised of one
Kbytes organized as
Glossary
Features
module implements a
A Flash word must be in the erased state before being programmed.
Cumulative programming of bits within a Flash word is not allowed.
512
64
rows of
Kbyte Flash (nonvolatile) memory. The Flash memory contains one
128
MC9S12Q128
CAUTION
bytes with an erase sector size of eight rows
Rev 1.09
64
Kbyte array divided into
64
sectors of
(1024
1024
bytes).
bytes
497