MC68HC705K1 Datasheet, PDF (87/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
EPROM/OTPROM
EPROM Erasing
9.5 EPROM Erasing
MCUs with windowed packages permit EPROM erasure with ultraviolet
light. Erase the EPROM by exposing it to 15 Ws/cm² of ultraviolet light
with a wave length 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.
9.6 Mask Option Register
The mask option register (MOR) is an EPROM/OTPROM byte that
controls these options:
• Port A and port B programmable pulldown devices (enable or
disable)
• Oscillator connections (2-pin or 3-pin RC oscillator)
• Oscillator connections (RC oscillator or crystal/ceramic resonator)
• STOP instruction (enable or disable)
• Low-voltage reset (enable or disable)
• Port A external interrupt function (enable or disable)
• IRQ trigger sensitivity (edge-triggered only or both edge- and
level-triggered)
• COP watchdog (enable or disable)
The mask option register is unaffected by reset. The erased state of the
mask option register is $0000.
Address: $0017
Bit 7
6
5
4
3
2
1
Read:
SWPDI PIN3
Write:
RC SWAIT LVRE PIRQ LEVEL
Reset:
Unaffected by reset
Erased: 0
0
0
0
0
0
0
Figure 9-3. Mask Option Register (MOR)
Bit 0
COPEN
0
MC68HC705K1 — Rev. 2.0
EPROM/OTPROM
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Technical Data