MC68HC705J2 Datasheet, PDF (41/82 Pages) Freescale Semiconductor, Inc – member of the low-cost

Freescale Semiconductor, Inc.
Take the following steps to program a byte of EPROM:
1. Apply 16.5 V to the IRQ/V_PP pin.
2. Set the LATCH bit.
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3. Write to any EPROM address.
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4. Set the EPGM bit for a time t_EPGM to apply the programming voltage.
5. Clear the LATCH bit.
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6.1.3.2 EPROM Erasing
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The erased state of an EPROM bit is zero. Erase the EPROM by exposing it to 15
Ws/cm² of ultraviolet light with a wavelength of 2537 angstroms. Position the
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ultraviolet light source 1 inch from the EPROM. Do not use a shortwave filter.
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NOTE
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Windowed packages must have the window covered during
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programming and operation.
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6.1.4 Bootloader ROM
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Addresses $0F01–$0FEF contain the bootloader ROM, which can copy and verify
the contents of an external EPROM to the on-chip EPROM. See SECTION 8
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BOOTLOADER MODE.
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MEMORY
Rev. 2
6-5
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