Atmel AVR instruction set: Difference between revisions

Revision as of 04:25, 6 June 2022

Revision as of 04:28, 6 June 2022

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===Status bits===

The status register bits are:

#<li value=0> C [[Carry flag]]. This is a borrow flag on subtracts. The <code>INC</code> and <code>DEC</code> instructions do ''not'' modify the carry flag, so they may be used to loop over multi-byte arithmetic operations.<ref name="isa_manual">{{cite web |url=http://ww1.microchip.com/downloads/en/devicedoc/atmel-0856-avr-instruction-set-manual.pdf |title=AVR Instruction Set Manual |date=November 2016 |publisher=Atmel |id=Atmel-0856L}}</ref></li>

# Z [[Zero flag]]. Set to 1 when an arithmetic result is zero.

# N [[Negative flag]]. Set to a copy of the most significant bit of an arithmetic result.

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**[https://web.archive.org/web/20050714015338/http://users.rcn.com/rneswold/avr/ A GNU Development Environment for the AVR Microcontroller] by Rich Neswold

**[https://gcc.gnu.org/onlinedocs/gcc-3.3.5/gcc/AVR-Options.html AVR Options] in GCC-AVR

*[http://ww1.microchip.com/downloads/en/devicedoc/atmel-0856-avr-instruction-set-manual.pdf AVR Instruction Set Manual PDF]

*[http://starlo.org/blake/boardmicro/ AVR Instruction Set Simulator (ATmega32u4 for GCC Intel Hex Files)]

*[https://github.com/avr-llvm/architecture/blob/master/Instructions/inheritance.md AVR Instruction Set Inheritance] (LLVM note), based on this page and GCC & Binutils code