MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 51

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

Chapter 4
FLASH-1 Memory
4.1 Introduction
This chapter describes the operation of the embedded FLASH-1 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.
4.2 Functional Description
The FLASH-1 memory is an array of 32,256 bytes with two bytes of block protection (one byte for
protecting areas within FLASH-1 array and one byte for protecting areas within FLASH-2 array) and an
additional 40 bytes of user vectors on the MC68HC908AS60A and 52 bytes of user vectors on the
MC68HC908AZ60A. An erased bit reads as a logic 1 and a programmed bit reads as a logic 0.
Memory in the FLASH-1 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-1 Control Register (FL1CR). Details for these operations appear later in this
chapter.
The FLASH-1 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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$8000–$FDFF: User Memory (32,256 bytes)
$FF80: FLASH-1 Block Protect Register (FL1BPR)
$FF81: FLASH-2 Block Protect Register (FL2BPR)
$FF88: FLASH-1 Control Register (FL1CR)
$FFCC–$FFFF: these locations are reserved for user-defined interrupt and reset vectors. (Please
see
2.4 Vector Addresses and Priority
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
A security feature prevents viewing of the FLASH contents.
for details)
NOTE
(1)
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