AN1827 Freescale Semiconductor / Motorola, AN1827 Datasheet - Page 3

• Manufacturer Part Number: AN1827
• Description: Programming and Erasing FLASH Memory on the MC68HC908AS60
• Manufacturer: Freescale Semiconductor / Motorola

Implementation on Motorola’s M68HC08 Microcontrollers
AN1827
MOTOROLA
The specific FLASH technology found on the MC68HC908AS60 is
known as FLASH 2TS, in reference to its 2-transistor source-select bit
cell. FLASH 2TS is commonly found on Motorola’s M68HC08 Family of
microcontrollers, but it is not the exclusive FLASH technology for the
HC08 core. The FLASH 2TS technology discussed in this application
note is referred to generically as FLASH.
This FLASH technology is available in array sizes between 2 Kbytes and
32 Kbytes. For parts requiring more than 32 Kbytes, multiple arrays of
any size between 2 Kbytes and 32 Kbytes, with 2-Kbyte boundaries, can
be placed on a chip. Typically, only one charge pump is used on parts
with multiple arrays. This constrains program or erase operations to one
array at a time, but conserves die area.
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Freescale Semiconductor, Inc.
For More Information On This Product,
The FLASH manufacturing process is fully compatible with the
EEPROM (electrically erasable, programmable read-only
memory) process.
This process compatibility allows the functionality of both FLASH
and EEPROM non-volatile memories on the same chip.
Meets automotive specifications
Unlike many competing microcontrollers with FLASH, this FLASH
can operate and meet reliability requirements for the automotive
space. The FLASH on the MC68HC908AS60 will read, program,
and erase over the –40 C to 125 C temperature range. The
specified program/erase endurance and data retention lifetime are
valid over the entire temperature range.
Multiple arrays
Multiple arrays on the MC68HC908AS60 allow code execution out
of one array while programming or erasing the other array.
Smart programming algorithm
Use of the smart programming algorithm ensures minimum
program time while still guaranteeing automotive environment
operation and data retention.
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Implementation on Motorola’s M68HC08 Microcontrollers
Application Note
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