| View previous topic :: View next topic |
| Author |
Message |
sulung
Joined: 23 Dec 2006
Posts: 2
Location: Indonesia
|
 Posted: Sat Dec 23, 2006 9:46 am Post subject: please help on MC68B09EP |
 |
|
Hi everybody,
I was working on honeywell PLC which use MC68B09EP micro. according to its datasheet, it require external crystal or external clock at its pin 38. i have traced every single line on the pcb but could not find any trace lead to pin 38. my question is: does this proc has its on internal clocking device? thank you. |
|
| Back to top |
|
 |
chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
|
| Posted: Sat Dec 23, 2006 12:18 pm Post subject: |
|
|
No. In the 6809E, crystal pins 38 and 39 were reassigned for use in multiprocessor systems. Clocking is done externally, via pins 34 and 35.
- CMW |
|
| Back to top |
|
|
chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
|
|
| Back to top |
|
|
sulung
Joined: 23 Dec 2006
Posts: 2
Location: Indonesia
|
| Posted: Sun Dec 24, 2006 11:34 am Post subject: |
|
|
 THANK YOU VERY MUCH!!!! |
|
| Back to top |
|
|
|
