AN2156 Freescale Semiconductor / Motorola, AN2156 Datasheet - Page 7

• Manufacturer Part Number: AN2156
• Description: Programming and Erasing FLASH and EEPROM Memories on the MC68HC908AS60A/AZ60A
• Manufacturer: Freescale Semiconductor / Motorola

FLASH Functional Description
AN2156
MOTOROLA
NOTE:
The FLASH memory on the MC68HC908AS60A/AZ60A physically
consists of two independent arrays each with two bytes of block
protection. An erased bit reads as a logic 1 and a programmed bit reads
as a logic 0. Program and erase operations are facilitated through
control bits in memory-mapped registers. Details for these operations
appear later in this application note.
Memory in the FLASH array is organized into 128 byte pages, and each
page is subdivided into two rows of 64 bytes each. The minimum erase
block size is a single page of 128 bytes. Programming is performed on
a per-row basis, 64 bytes at a time. The address ranges for the user
memory, control registers, block protect registers, and vectors are listed
here.
The FLASH memory map on the MC68HC908AS60A/AZ60A consists
of:
The memory map of the MC68HC908AZ60A differs slightly from the
MC68HC908AS60A. On the MC68HC908AZ60A:
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Freescale Semiconductor, Inc.
For More Information On This Product,
$0450–$05FF, FLASH-2 array, 432 bytes (See Note)
$0E00–$7FFF, FLASH-2 array, 29,184 bytes
$8000–$FDFF, FLASH-1 array, 32,256 bytes
$FE08, FLASH-2 control register, FL2CR
$FF80, FLASH-1 block protect register, FL1BPR
$FF81, FLASH-2 block protect register, FL2BPR
$FF88, FLASH-1 control register, FL1CR
$FFD2–$FFD3, $FFDA–$FFFF, vector space;
subset of FLASH-1 area, 40 bytes (See Note)
The FLASH-2 array is not continuous. It is divided into three
sections: $0450–$04FF (176 bytes), $0580–$05FF (128 bytes),
and $0E00–$7FFF (29,184 bytes)
$FFCC–$FFD1 and $FFD4–$FFD9 are also defined vector
addresses (total vector size is 52 bytes).
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FLASH Functional Description
Application Note
7