topic can ACK package make a interrupt in MC9S08JM60 USB? in 8-bit Microcontrollers

can ACK package make a interrupt in MC9S08JM60 USB?

wangbaode — Thu, 22 Jan 2015 02:09:09 GMT

hi everyone,

I'm using USB module of Mc9S08JM60 .I have two questions.

1, if Host send an ACK package,does device make a interrupt ?

2, How to send an ACK package to host in MC9S08JM60?

Re: can ACK package make a interrupt in MC9S08JM60 USB?

vicentegomez — Wed, 04 Feb 2015 20:20:11 GMT

Hi Wang

I found that you have asked here, I know that you already sold the problem, but I want to document it, so here is my answer

The ACK is handled by SIE of USB and it does not need the intervention of firmware.

Bit TOKDNEF in Interrupt Status Register(INTSTAT) will be set when the current transaction is completed.

And an interrupt is generated if TOKDNE is set. Then the firmware can read the STAT register to determine the endpoint and BD information.

Have a great day,
Vicente

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Re: can ACK package make a interrupt in MC9S08JM60 USB?

wangbaode — Thu, 05 Feb 2015 02:02:47 GMT

Hi Vicente,

Thank you . According to the document, It's not a problem for me.

bye