AVR Architecture: Slide 50

Stack Instructions

These instructions allow function calls to be implemented. They'll be covered in a subsequent lecture.

CALL k	1001 010k kkkk 111k kkkk kkkk kkkk kkkk	SRAM[SP:SP-1] = PC;SP = SP - 2; PC = k
ICALL	1001 0100 0000 1001	SRAM[SP:SP-1] = PC;SP = SP - 2; PC = R31:R30
RET	1001 0101 0000 1000	SP = SP + 2;PC = SRAM[SP:SP+1]
POP Rd	1001 000d dddd 1111	SP = SP + 1;Rd = SRAM[SP]
PUSH Rd	1001 001d dddd 1111	SRAM[SP] = Rd; SP = SP - 1