Hello Hannu, > TCCR1A_COM1A TCCR1A_COM1B or TCCR1A c! And all those four bits are set. > > However most of the time COM1A part of register shouldn't be 11 but for > example 10 > > So how do you guys write TCCR1A_COM1A lowerBitClearPlease c! with register > names?
The bitmap: words defines the bits, which are changeable. To apply a particular bit pattern, the word pin! takes the bit pattern and the bitmap: word. It changes the bits which are set to 1 in the bitmap: into the ones from the bit pattern. All other bits remain the same. example (from SPI, which I rewrote recently to use the bitnames.frt words, currently only in the svn) SPCR %00001100 bitmask: spi.mode $0 constant spi.mode0 \ sample rising/-- $4 constant spi.mode1 \ --/sample falling $8 constant spi.mode2 \ sample falling/-- $c constant spi.mode3 \ --/sample rising : spi.setmode ( spi-mode -- ) spi.mode pin! ; Used as spi.mode0 spi.setmode Similiar the spi.setspeed word. Note that the bit patterns from the different modeX definitions already match the bitmap: definition. "high" and "low" change all bits which are set to 1 in the bitmap: definition. They could be seen as address bitmap bitmap: example $ff example pin! \ high $00 example pin! \ low HTH Matthias ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
