is some
Only Bulk
solved by
this key a
Backdoor Access Key disabled there is no
possibilities to disable security. To solve this problem the second method of security disabling
must b
Chip mode
below:
when link with MCU completed it is necessarily to read all FLASH and
ore information see sections 5.1.3 On-
ave EEPROM and
ce panel. Also, press
rmanent
green light, erasing
solder it back to board.
Figure 2).
rom Motorola device socket (see
Figure 1)
.
are (“Device” Button).
e, $7BF0F Address to $FE in Hex Editor. That
e changes in
EEPROM and FLASH areas are possible.
If furth
Press “
Press “
LED D
regulat
When
comple
If some errors appeared during programming process refer to Section 7.
&
Note
: There is no way to restore EEPROM and FLASH contents after erasing.
That is strongly recommended read EEPROM and FLASH contents and save it
to file before erasing.
&
Note
: When target MCU mounted on adaptor check contacts careful to avoid
short circuit. Otherwise target MCU
can be damaged!
&
Note
: During removing the adaptor with target MCU
HC912-Programmer
must
be powered off to avoid damaging of programmer and target MCU!
problem exists with running of Sector Erase and Program Commands when MCU secured.
Erase of FLASH and EEPROM command possible. In many cases this problem can be
disabling of security via Backdoor Access Key.
HC912-Programmer
automatically read
nd passes the security sequence. But if
e used. After erasing FLASH and EEPROM, target MCU can be accessed in Special Single
(
HC912-Programmer
In-Circuit interface). Follow instructions
Read full EEPROM and FLASH contents in On-Board programming interface.
First of all,
EEPROM contents and save it to File. For m
Board EEPROM/FLASH reading example. It is obligatory to s
FLASH contents to file (see Section 6.2).
Erase EEPROM and FLASH.
Press Erase FLASH and EEPROM buttons on Program Sequen
Verify EEPROM and FLASH buttons to perform erase check.
Press Start button.
When
LED D1 on
HC912-Programmer
became pe
completed.
Disconnect power from
HC912-Programmer.
Remove target MCU from programmer and
Prepare target MCU for In-Circuit Programming.
Connect required pins to board with target MCU (see Appendix
Remove any adaptor f
Apply power to
HC912-Programmer.
LED D1 became to green light (see
Table 1
).
Select corresponding device in
HC912-Programmer
softw
Load EEPROM/FLASH data from previous saved file.
Change value of FLASH Security byt
mean that device will be unsecured after programming. Also, som
er access to MCU is not required, FLASH Security byte not need to be changed.
EEPROM/FLASH” button on Program Sequence Panel.
Start” button.
4 on
HC912-Programmer
became to green light. That means that +5 voltage
or switched on and VCC applied to target MCU.
LED D1 on
HC912-Programmer
became permanent
green, programming
ted. Target MCU powered off.
©ETL 2004-2006
MC68HC912/9S12 Programmer User’s Guide
10
