Addressing Modes-Register : Data is conteined in given register
Examples : mov a, b ; A <- B
: movh a, sp ; A <- SP (MSB)
-Immediate : Data if given in the byte(s) following the op. cod.
Examples : movi a, data ; A <- 8-bits data
: movi sp, data ; SP <- 16-bits data
-Direct : Data is in the memory location which address is given in the two bytes following the op. cod.
Example : ld a, addr ; A <- [addr]
-Indirect : Data is in the memory location which address is contained in register X or Y
Example : ldx a, x ; A <- [X]
-Stack : Data comes from the Stack (always pointed by register SP)
Example : pop a ; A <- [SP]; SP <- SP-1
-INC/DEC : Register is incremented or decremented in a sigle clock cyle (no data transfer occurs).
Example : dec c ; C <- C-1
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Homebuilt CPUs WebRing
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Project start date: May 13 of 2009
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