68300

Mot has a very good application note (AN1724/D) on an interrupt driven
serial handler for the SCI. If you don't use it directly, it might give you
some ideas.

------------------------o0o------------------------
Jeff Clarke
Orbital Sciences Corporation


                                                                                                                                       
                      "john_gma"                                                                                                       
                      <johnshaffer@mail        To:       68300@yahoogroups.com                                                         
                      .com>                    cc:                                                                                     
                                               Subject:  [68300] MC68376 QSM SCI                                                       
                      09/10/02 11:30 AM                                                                                                
                      Please respond to                                                                                                
                      68300                                                                                                            
                                                                                                                                       
                                                                                                                                       




Hello all,

I am writing a serial driver for the QSM SCI.

My question is in regards to the interrupt handling.

There does not seem to be a separate ISR.
How do I clear the interrupts?

There are 2 flags I need to use, TDRE and TC.

The book says that the flags are cleared by:
1. reading SCSR (OK, I do that)
2. Writing to TDR (I don't always want to do this)

So, how do I acknowledge the interrupt without transmitting something?

Can I write $0000 to SCSR?

Thanks

John







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