Freescale Semiconductor, Inc.
EPROM/OTPROM (PROM)
9.3.2 Preprogramming Steps
Before programming the PROM using an MC68HC05PGMR PCB in
standalone mode, the user should ensure that:
• A jumper is installed on pins 1 and 2 of mode select header J1.
• An EPROM is programmed with the necessary user code.
• The erasure window (if any) of the device to be programmed is
covered.
• VDD of +5 Vdc is available on the board.
• VPP is available on the board.
NOTE: If the VPP level at the MCU exceeds +16 Vdc, then the MC68HC705C8A
MCU device will suffer permanent damage.
Once those conditions are met, the user should take these steps before
beginning programming:
1. Remove the VPP power source.
2. Set switch 1 in the OFF position (removes VDD).
3. Place the programmed EPROM in socket U1.
4. Insert the erased PROM MCU device to be programmed in the
proper socket:
– MC68HC705C8S or MC68HC705C8P in socket U2 (40-pin
dual in-line package (DIP)) or
– MC68HC705C8FN in socket U3 (44-pin plastic leaded chip
carrier (PLCC)) with the device notch at the upper right corner
of the socket.
5. Set switch S2 in the RESET position.
NOTE: No PROM MCU should be inserted in or removed from its board socket
(U2 or U3) while VPP (P1, slot 5) or VDD (switch 1) is active on the board.
Technical Data
110
MC68HC705C8A — Rev. 3
EPROM/OTPROM (PROM)
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