Am 10.05.2012 14:18, schrieb Jan Kromhout: > Hello, > > I'm looking in some code to look how the analog write is working. > I see commands like sbi(…,…) and chi(…,…)
SBI means Set Bit in Io-register. CBI in analogy Clear Bit in Io register. The atmegas use a 5bit address range for some IO registers (mostly PORTs and CPU related stuff like stack pointers). This is by far not enough for all IO related things. But this limited address space can be used with a special instruction set (sbi and cbi) to manipulate single bits in one (or two) CPU cycles. A similiar instruction set exists for the 32 CPU registers: SBR and CBR Atmel has published a lengthy document "8-bit AVR Instruction Set" that covers each and every command. Matthias ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
