Freescale Semiconductor, Inc.
EPROM/OTPROM
EPROM Programming
addresses $1FF0–$1FFF which includes the mask option register at
address $1FF1, and the security bit at address $1FF0.
NOTE: To program the EPROM/OTPROM, MOR or EPMSEC bits properly, the
V
voltage must be greater than 4.5 volts.
DD
13.4.1 MOR Prog ra m m ing
The contents of the MOR should be programmed using the programmer
board. To program any bits in the MOR, the desired bit states must be
written to the MOR address and then the MPGM bit in the EPROG
register must be used. The following sequence will program the MOR:
1. Write the desired data to the MOR location ($1FF1).
2. Apply the programming voltage to the IRQ/V pin.
PP
3. Set the MPGM bit in the EPROG.
4. Wait for the programming time, t
.
MPGM
5. Clear the MPGM bit in the EPROG.
6. Remove the programming voltage from the IRQ/V pin.
PP
Once the MOR bits have been programmed, some of the options may
experience glitches in operation after removal of the programming
voltage. It is recommended that the part be reset before trying to verify
the contents of the user EPROM or the MOR itself.
NOTE: The contents of the EPROM or the MOR cannot be accessed if the
EPMSEC bit in the COP register has been set.
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
General Release Specification
EPROM/OTPROM
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