Freescale Semiconductor, Inc.
Personality EPROM
PEPROM Erasing
Reading the PEPROM is easiest when each PEPROM column contains
one byte. Selecting a row 0 bit selects the first bit, and incrementing the
PEPROM bit select register (PEBSR) selects the next bit in row 1 from
the same column. Incrementing PEBSR seven more times selects the
remaining bits of the column and ends up selecting the bit in row 0 of the
next column, thereby setting the row 0 flag, PEPRZF.
NOTE: A PEPROM byte that has been read can be transferred to the
personality EPROM bit select register (PEBSR) as a temporary storage
location such that subsequent reads of the PEBSR quickly yield that
PEPROM byte.
12.6 PEPROM Era sing
MCUs with windowed packages permit PEPROM erasure with
2
ultraviolet light. Erase the PEPROM by exposing it to 15 Ws/cm of
ultraviolet light with a wavelength of 2537 angstroms. Position the
ultraviolet light source 1 inch from the window. Do not use a shortwave
filter. The erased state of a PEPROM bit is a logic zero.
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
General Release Specification
Personality EPROM
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