XC68HC705JJ7 Motorola, XC68HC705JJ7 Datasheet - Page 190

• Manufacturer Part Number: XC68HC705JJ7
• Description: MICROCONTROLLER
• Manufacturer: Motorola

EPROM/OTPROM
13.4.2 EPMSEC Programming
13.5 EPROM Erasing
Advance Information
190
NOTE:
The EPMSEC bit is programmable. To program the EPMSEC bit, the
desired state must be written to the COP address and then the MPGM
bit in the EPROG register must be used. The following sequence will
program the EPMSEC bit:
Once the EPMSEC bit has been programmed to a logic 1, access to the
contents of the EPROM and MOR in the expanded non-user modes will
be denied. It is therefore recommended that the user EPROM and MOR
in the part first be programmed and fully verified before setting the
EPMSEC bit.
MCUs with windowed packages permit EPROM erasing with ultraviolet
light. Erase the EPROM by exposing it to 15 Ws/cm
with a wavelength of 2537 angstroms. Position the ultraviolet light
source 1 inch from the window. Do not use a shortwave filter. The erased
state of an EPROM bit is a logic 0.
Unlike many commercial EPROMs, an erased EPROM byte in the MCU
will read as $00. All unused locations should be programmed as 0s.
1. Write the desired data to bit 7 of the COPR location ($1FF0).
2. Apply the programming voltage to the IRQ/V
3. Set the MPGM bit in the EPROG.
4. Wait for the programming time, t
5. Clear the MPGM bit in the EPROG.
6. Remove the programming voltage from the IRQ/V
EPROM/OTPROM
MC68HC705JJ7 • MC68HC705JP7 — REV 4
MPGM
.
PP
2
of ultraviolet light
pin.
PP
pin.
MOTOROLA