MC68HC705J1ACPE Datasheet, PDF (40/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

Memory
Freescale Semiconductor, Inc.
NOTE:
Writing logic 1s to both the ELAT and EPGM bits with a single instruction
sets ELAT and clears EPGM. ELAT must be set first by a separate
instruction.
Bits [7:3] — Reserved
Take these steps to program a byte of EPROM/OTPROM:
1. Apply the programming voltage, V_PP, to the IRQ/V_PP pin.
2. Set the ELAT bit.
3. Write to any EPROM/OTPROM address.
4. Set the EPGM bit and wait for a time, t_EPGM.
5. Clear the ELAT bit.
2.6.3 EPROM Erasing
The erased state of an EPROM bit is logic 0. Erase the EPROM by
exposing it to 15 Ws/cm² of ultraviolet light with a wave length of
2537 angstroms. Position the ultraviolet light source one inch from the
EPROM. Do not use a shortwave filter.
2.7 Mask Option Register
The mask option register (MOR) is an EPROM/OTPROM byte that
controls these options:
• COP watchdog (enable or disable)
• External interrupt pin triggering (edge-sensitive only or edge- and
level-sensitive)
• Port A external interrupts (enable or disable)
• Port pulldown resistors (enable or disable)
• STOP instruction (stop mode or halt mode)
• Crystal oscillator internal resistor (enable or disable)
• EPROM security (enable or disable)
• Short oscillator delay (enable or disable)
Technical Data
MC68HC705J1A — Rev. 4.0
Memory
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