MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 61

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Chapter 5
FLASH-2 Memory
5.1 Introduction
This chapter describes the operation of the embedded FLASH-2 memory. This memory can be read,
programmed and erased from a single external supply. The program and erase operations are enabled
through the use of an internal charge pump.
5.2 Functional Description
The FLASH-2 memory is a non-continuos array consisting of a total of 29,616 bytes on the
MC68HC908AS60A and 29,488 bytes on the MC68HC908AZ60A. An erased bit reads as a logic 1 and
a programmed bit reads as a logic 0.
Memory in the FLASH-2 array is organized into rows within pages. There are two rows of memory per
page with 64 bytes per row. The minimum erase block size is a single page,128 bytes. Programming is
performed on a per-row basis, 64 bytes at a time. Program and erase operations are facilitated through
control bits in the FLASH-2 Control Register (FL2CR). Details for these operations appear later in this
chapter.
The FLASH-2 memory map consists of:
Programming tools are available from Freescale. Contact your local Freescale representative for more
information.
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
Freescale Semiconductor
unauthorized users.
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$0450–$05FF: User Memory on MC68HC908AS60A (432 bytes)
$0450–$04FF: User Memory on MC68HC908AZ60A (176 bytes)
$0580–$05FF: User Memory on MC68HC908AZ60A (128 bytes)
$0E00–$7FFF: User Memory (29,616 bytes)
$FF81: FLASH-2 Block Protect Register (FL2BPR)
$FE08: FLASH-2 Control Register (FL2CR)
FL2BPR physically resides within FLASH-1 memory addressing space
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
A security feature prevents viewing of the FLASH contents.
NOTE
NOTE
(1)
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