Handout 4-AddrModes_Examples

Handout 4-AddrModes_Examples - Handout 4 - 68HC12/S12...

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Handout 4 - 68HC12/S12 Address Mode Info & Program Examples 68HC12 Addressing Mode Summary Indexed Addressing Mode Operations
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Indexed Addressing Mode Offset Reference Source Code Example Machine Code Cycles 5-bit signed constant offset -16. ..+15 X, Y, SP, PC LDAA 15,X A6 0F 3 9-bit signed constant offset -256. ..+255 X, Y, SP, PC LDAA 255,Y A6 E8 FF 3 16-bit signed constant offset -32768. ..+65535 X, Y, SP, PC LDAA 4096,PC A6 FA 10 00 4 8-bit accumulator (A or B) offset accA, accB X, Y, SP, PC LDAA B,SP A6 F5 3 16-bit accumulator offset accD X, Y, SP, PC LDAA D,X A6 E6 3 Auto Pre-Increment by +1. ..+8 1…8 X, Y, SP LDAA 8,+SP A6 A7 3 Auto Pre-Decrement by - 1…-8 -1…-8 X, Y, SP LDAA 8,-Y A6 68 3 Auto Post-Increment by +1. ..+8 1…8 X, Y, SP LDAA 1,X+ A6 30 3 Auto Post-Decrement by -1…-8 -1…-8 X, Y, SP LDAA 4,X- A6 3C 3 16-bit offset indexed- indirect -32768. ..+65535 X, Y, SP, PC LDAA [4096,X] A6 E3 10 00 6 D accumulator indexed- indirect
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This note was uploaded on 09/29/2009 for the course ECE 331 taught by Professor M.shanblatt during the Spring '08 term at Michigan State University.

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Handout 4-AddrModes_Examples - Handout 4 - 68HC12/S12...

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