MC68HC705K1 Datasheet, PDF (97/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Personality EPROM (PEPROM)
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 row 1 bit from the
same column. Incrementing PEBSR seven more times selects the
remaining bits of the column and selects the row 0 bit of the next column,
setting the row 0 flag, PEPRZF.
A PEPROM byte that has been read can be transferred to the
personality EPROM bit select register (PEBSR) so that subsequent
reads of the PEBSR quickly yield that PEPROM byte.
10.6 PEPROM Erasing
MCUs with windowed packages permit PEPROM erasure with
ultraviolet light. Erase the PEPROM by exposing it to 15 Ws/cm² of
ultraviolet light with a wave length 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 0.
MC68HC705K1 — Rev. 2.0
Personality EPROM (PEPROM)
For More Information On This Product,
Go to: www.freescale.com
Technical Data