MC68HC705P9 Datasheet, PDF (41/160 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Memory
EPROM/OTPROM
Complete the following steps to bootload the MCU:
CAUTION:
CAUTION:
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 V_DD power supply.
Turn on the V_DD power supply before turning on the V_PP power supply.
7. Turn on the V_PP 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 V_PP power supply.
Turn off the V_PP power supply before turning off the V_DD power supply.
11. Turn off the V_DD 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).
MC68HC705P9 — Rev. 4.0
MOTOROLA
Memory
For More Information On This Product,
Go to: www.freescale.com
Technical Data
41