68HC705SP7 datasheet(185/230 Pages) FREESCALE

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EPROM/OTPROM

EPROM Programming

MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0

General Release Specification

EPROM/OTPROM

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

VDD voltage must be greater than 4.5 volts.

13.4.1 MOR Programming

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

1. Write the desired data to the MOR location ($1FF1).

2. Apply the programming voltage to the IRQ/VPP pin.

3. Set the MPGM bit in the EPROG.

4. Wait for the programming time, tMPGM.

5. Clear the MPGM bit in the EPROG.

6. Remove the programming voltage from the IRQ/VPP pin.

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.

Freescale Semiconductor, Inc.

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68HC705SP7 数据表(PDF) 185 Page - Freescale Semiconductor, Inc