Using BSET BRES on IO-PORT

[darkknight]

Posted on February 10, 2010 at 05:44

Hi

Can BSET and BRES instructions be used on an IO-PORT like BSET     PADR,&sharp1 to turn an output on or do you have to do LD         A,PADR OR         A,&sharp1 LD         PADR,A TIA #ioport #ioport #ioport

[yundm2]

Posted on February 11, 2010 at 12:21

Yes. BSET and BRES  are simplest.

[wolfgang239955_stm1_st]

Posted on February 11, 2010 at 14:45

[wolfgang239955_stm1_st]

Posted on February 11, 2010 at 14:49 Suppose you mean:   BSET     PADR,#0 -with- LD         A,PADR OR         A,#1 LD         PADR,A Regards, WoRo

[jdf25252]

Posted on February 17, 2010 at 18:48

Be careful though.  At least on the F324, check the datasheet section 9.2.1 Note 3:  Do not use read/modify/write instructions (BSET or BRES) to modify the DR register as this might corrupt the DR content for I/Os configured as input.