Good morning,
I have a problem and i don't know how to solve:
in a custom board i'm using MKE04Z8VWJ4 programmed with codewarrior.
the reset pin PTA5 i use it as input I connect a resistence divider 1k and 1k and a cap 100nF and a zener 5,1 V to protect, normaly the input is low.
When I power on the board and the controller doesen't work (i connect 7 segment to other output and doesen't works), seems to enter in a strange mode, when i press the button i drive to 1 the input and the microcontroller wakes up ad run normaly.
If i disconnect the resistence that drive low the input, this strange behavior doesen't appeare.
How can i solve the issue by software?
Hi Marco Iannelli,
The KE series is special, even you disable the reset pin, but after POR reset, the PTA5 pin functions as reset, until you load the SIM_SOPT0 in the code, then your reset pin function will be disabled, and work as other function.
So, you must make sure, during POR reset, you need to keep the reset pin high, otherwise, your chip will work abnormal.
Wish it helps you!
If you still have question about it, please kindly let me know.
Have a great day,
Kerry
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Hi Kerry thank you for your help,
the reset pin is disabled via processor expert, I test other board with MC9S08QG8CPB and this strange behavior not appear if I disable the reset pin it remain inactive in MC9S.....
When I power on the board and the controller doesen't work (i connect 7 segment to other output and doesen't works), seems to enter in a strange mode, when i press the button i drive to 1 the input and the microcontroller wakes up ad run normaly.PTA5 IS SET LIKE INPUT NOT RESET. After the first push the input run correctly like input ant other output are activated and run correctly.
I mean:
have a nice day
Hi Marco Iannelli,
The KE series is special, even you disable the reset pin, but after POR reset, the PTA5 pin functions as reset, until you load the SIM_SOPT0 in the code, then your reset pin function will be disabled, and work as other function.
So, you must make sure, during POR reset, you need to keep the reset pin high, otherwise, your chip will work abnormal.
Wish it helps you!
If you still have question about it, please kindly let me know.
Have a great day,
Kerry
-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!
- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
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