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S12X EWAITE function

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S12X EWAITE function

‎09-04-2006 03:18 AM
1,131 Views
gpio
Contributor I
Hi, We have a LCD controller connected to a S12XDP512, The LCD controller wait pin is connected to EWAITE on the micro. When I enable The external wait function via EBCTRL1 the micro locks up and a COP intrrupt occurs. I notice that the LCD controller asserts it's Wait line ( active low) on a read or write, but it stays low, which I guess is upseting the micro/debugger. If I disable the External wait function, the line will go low and then high on aread or write. Does anyone have any idea why this happens? Cheers!
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‎09-07-2006 05:52 PM
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DanielM
Contributor III
Hi,

the PK7 pin is an input when the EWAIT function is disabled and you are doing nothing with the pin. I guess the signal is driven by your LCD controller. It probably asserts the WAIT signal as a response to the write operation on the bus and then de-asserts it again when the /WR signal disappears. Look into the spec of the LCD.

Daniel
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