mc68hc705j2 Freescale Semiconductor, Inc, mc68hc705j2 Datasheet - Page 57

• Manufacturer Part Number: mc68hc705j2
• Description: 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

6.1.3.2 EPROM Erasing
6.1.4 Bootloader ROM
MC68HC705J2
Take the following steps to program a byte of EPROM:
The erased state of an EPROM bit is zero. Erase the EPROM by exposing it to
15 Ws/cm
ultraviolet light source 1 inch from the EPROM. Do not use a shortwave filter.
Addresses $0F01–$0FEF contain the bootloader ROM, which can copy and
verify the contents of an external EPROM to the
SECTION 8 BOOTLOADER MODE.
1. Apply 16.5 V to the IRQ /V
2. Set the LATCH bit.
3. Write to any EPROM address.
4. Set the EPGM bit for a time t
5. Clear the LATCH bit.
Windowed packages must have the window covered during
programming and operation.
2
of ultraviolet light with a wavelength of 2537 angstroms. Position the
M E M O R Y
PP
EPGM
pin.
N O T E
to apply the programming voltage.
on-chip EPROM.
MOTOROLA
See
6-5