August 27, 1998
START
GENERAL RELEASE SPECIFICATION
ELAT=1
Write EPROM byte
EPGM=1
Wait 1ms
EPGM=0
ELAT=0
Write
additional
byte?
Y
N
END
Figure A-4. EPROM Programming Sequence
A.7 EPROM ERASING
MCUs with windowed packages permit EPROM erasure with ultraviolet light.
2
Erase the EPROM by exposing it to 15 Ws/cm of ultraviolet light with a wave-
length of 2537 angstroms. Position the ultraviolet light source 1 inch from the win-
dow. Do not use a shortwave filter. The erased state of an EPROM bit is a logic
one.
MC68HC05SB7
REV 2.1
MOTOROLA
A-5
FREESCALE [ Freescale ]
