Tristan, Thanks again for your hulp. Please can you provide me the link to download the datasheet your mention. When I look to the datasheets they only have about 25 pages!!.
Cheers, Jan > Op 5 nov. 2018, om 09:47 heeft Tristan Williams <h...@tjnw.co.uk> het > volgende geschreven: > > Jan, > >> The address is $1d. When I look to the documentation te bits 0 and 1 >> are R/W and the other bits are only Read (With a initial value of 0) >> When I do the command $1d c@ . I get a value of 0001000. How is that >> possible? Or do I something wrong? > > The answer to this lies in the memory map of the AVR. If you look at > page 72 in the datasheet you will see the address for EIMSK given as > > 0x1D (0x3D) > > Yes, two addresses. > > To see the contents of EIMSK in AmForth using c@ you need > > $3d c@ > > For the why see page 19 of the datasheet combined with a > Google of "avr memory map offset $20" > > The file amforth-root/avr8/devices/atmega328p/atmega328p.frt contains > > &61 constant EIMSK \ External Interrupt Mask Register > > (where &61 is $3d) along with the other constants and is a very useful > file. > > Tristan > > > > > > > _______________________________________________ > Amforth-devel mailing list for http://amforth.sf.net/ > Amforth-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/amforth-devel _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
