MC68HC705P9CS datasheet(41/160 Pages) FREESCALE

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Memory

EPROM/OTPROM

MC68HC705P9 — Rev. 4.0

Technical Data

MOTOROLA

Memory

Complete the following steps to bootload the MCU:

1. Turn off all power to the circuit.

2. Install the EPROM containing the code to be downloaded.

3. Install the MCU.

4. Select the bootloader function:

a. Open switches S2 and S3 to select the program and verify

function.

b. Open only switch S2 to select only the verify function.

5. Close switch S1.

6. Turn on the VDD power supply.

CAUTION:

Turn on the VDD power supply before turning on the VPP power supply.

7. Turn on the VPP power supply.

8. Open switch S1. The bootloader code begins to execute. If the

PROGRAM function is selected, the PROGRAM LED turns on

during programming. If the VERIFY function is selected, the

VERIFY LED turns on when verification is successful. The

PROGRAM and VERIFY functions take about 10 seconds.

9. Close switch S1.

10. Turn off the VPP power supply.

CAUTION:

Turn off the VPP power supply before turning off the VDD power supply.

11. Turn off the VDD power supply.

3.6.2 EPROM Erasing

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 ultraviolet light source one inch from the

EPROM. Do not use a shortwave filter.

Cerdip packages have a transparent window for erasing the EPROM

with ultraviolet light. In the windowless PDIP and SOIC packages, the

2104 EPROM bytes function as one-time programmable ROM

(OTPROM).

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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