MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 41

• Manufacturer Part Number: MC68HC705P9CDW
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

3.6.2 EPROM Erasing
MC68HC705P9 — Rev. 4.0
MOTOROLA
CAUTION:
CAUTION:
Complete the following steps to bootload the MCU:
Turn on the V
Turn off the V
The erased state of an EPROM bit is zero. Erase the EPROM by
exposing it to 15 Ws/cm
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).
10. Turn off the V
11. Turn off the V
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:
5. Close switch S1.
6. Turn on the V
7. Turn on the V
8. Open switch S1. The bootloader code begins to execute. If the
9. Close switch S1.
Freescale Semiconductor, Inc.
For More Information On This Product,
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.
a. Open switches S2 and S3 to select the program and verify
b. Open only switch S2 to select only the verify function.
function.
Go to: www.freescale.com
DD
PP
power supply before turning off the V
power supply before turning on the V
DD
PP
PP
DD
Memory
power supply.
power supply.
power supply.
power supply.
2
of ultraviolet light with a wavelength of 2537
DD
PP
EPROM/OTPROM
power supply.
power supply.
Technical Data
Memory
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