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9. APPENDIX
HC912/9S12 MCU
RESET
BKGD
V
SS
MODA
MODB
V
DD
Gnd
ECLK
EXTAL
XTAL
2...16 MHz
Logic level on this pin must be “LOW”
HC912 Programmer
P5
1
2
4
6
BKGD
Gnd
RESET
Logic level on this pin must be “LOW”
External circuit *
1 K
1 K
Gnd
>1 K
Note:
To avoid damaging of ECLK pin
it must be connected to external circuit
via resistor equal or grater than 1 Kohm.
V
DD
Figure 2. In-Circuit programming schematic diagram for HC912/9S12 MCU
©ETL 2004-2006
MC68HC912/9S12 Programmer User’s Guide
15