mc68hc705c4acfn Freescale Semiconductor, Inc, mc68hc705c4acfn Datasheet - Page 114

• Manufacturer Part Number: mc68hc705c4acfn
• Description: M68hc05 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

EPROM/OTPROM (PROM)
9.5.3 Mask Option Register 2
9.6 EPROM Erasing
Technical Data
114
Address:
The mask option register 2 (MOR2) shown in
register that enables the non-programmable COP watchdog. Data from
MOR2 is latched on the rising edge of the voltage on the RESET pin.
(See
Reset.)
NCOPE— Non-Programmable COP Watchdog Enable Bit
The erased state of an EPROM or OTPROM byte is $00. EPROM
devices can be erased by exposure to a high intensity ultraviolet (UV)
light with a wave length of 2537 Å. The recommended erasure dosage
(UV intensity on a given surface area times exposure time) is 15
Ws/cm
EPROM device should be positioned about one inch from the UV
source.
OTPROM devices are shipped in an erased state. Once programmed,
they cannot be erased. Electrical erasing procedures cannot be
performed on either EPROM or OTPROM devices.
Erased:
Reset:
Read:
Write:
This EPROM bit enables the non-programmable COP watchdog.
5.3.3 Computer Operating Properly (COP) Watchdog
1 = Non-programmable COP watchdog enabled
0 = Non-programmable COP watchdog disabled
2
$1FF1
. UV lamps should be used without short-wave filters, and the
Bit 7
0
Figure 9-6. Mask Option Register 2 (MOR2)
EPROM/OTPROM (PROM)
= Unimplemented
6
0
5
0
MC68HC705C4A • MC68HSC705C4A — Rev. 3.0
Unaffected by reset
4
0
3
0
Figure 9-6
2
0
is an EPROM
1
0
MOTOROLA
NCOPE
Bit 0
0