Freescale Semiconductor, Inc.
GENERAL RELEASE SPECIFICATION
Bulk Erase/Program Verify
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To use the bootloader circuit to bulk erase, program, and verify the user
EEPROM, follow this sequence:
1. Close RESET switch so RESET is low upon power up.
2. Open PTC4 switch so PTC4 remains high during reset sequence.
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3. Make sure code to be loaded into user EEPROM is in the external
EPROM (shown as 27C128).
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4. Apply 12 V power to IRQ.
5. Release RESET.
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6. Programming LED will be on during bulk erase and programming. (The
code in the 27C128 will be loaded into the user EEPROM and MOR.)
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7. When programming is finished, the programming LED will turn off.
8. When the verify is finished, verify LED will turn on.
9. Close RESET switch.
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10. Remove 12 V from IRQ, then remove power.
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A
NOTE
Bootloader mode is the only mode in which the user can program the
8K user EEPROM and MOR. The 128-byte EEPROM can be
programmed in user mode.
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OPERATING MODES
MC68HC805P18
6-4
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