AN1836 Motorola / Freescale Semiconductor, AN1836 Datasheet - Page 26

• Manufacturer Part Number: AN1836
• Description: FLASH Programming for Motorola MC68HC912 Microcontrollers
• Manufacturer: Motorola / Freescale Semiconductor

Application Note
Alternative V
26
FP
Circuitry
The solution shown in this application note uses the ST662A dc-dc
converter, but any similar device will work. Some other options are the
LTC1262C from Linear Technology Corporation or the MAX662 from
Maxim Integrated Products, Inc.
Another option to placing a dc-dc converter on the application board for
in-circuit reprogramming is to supply V
This can be achieved by using something similar to the circuit shown in
Figure
mode) connections be made on the target board to allow for connection
of a BDM-compliant debug tool, as well as a V
as the V
Also, bear in mind that a voltage regulator on V
the 700 A of current or so which will flow upward through R2 during a
program or erase cycle, preventing it from being injected back into the
microcontroller.
13. This solution requires that the BDM (background debug
FP
envelope rules are adhered to, this circuit will work well.
FP
from outside the target system.
DD
FP
supply. Again, as long
must be able to accept
MOTOROLA
AN1836