11.07.2015 Views

section 7 - Index of

section 7 - Index of

section 7 - Index of

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

EXAMPLE: MOVE Y:$5432,BOBEFORE EXECUTIONB2 B1 BO55 48 47 24 23 0I X X I X X X X X xl X X X X X X I7 0 23 0 23 0AFTER EXECUTIONB2 B1 BO55 4847 2423 0I X X I X X X X X XIA BCD E F I7 0 23 0 23 023 Y MEMORY 0$5432~23 Y MEMORY 0$5~2~-Assembler Syntax: XXX X or aaMemory Spaces: P:Additional Instruction Execution Time (Clocks): 2Additional Effective Address Words: 1Figure 6-8 Special Addressing - Absolute Addressing6.3.5.3.6 1/0 ShortClassified as a memory reference, the liD short addressing mode is similar to absoluteshort addressing. The address <strong>of</strong> the operand occupies six bits in the instruction operationword. 110 short is used with the bit manipulation and MOVEP instructions. The liD shortaddress is ones extended to 16 bits to address the 1/0 portion <strong>of</strong> X and Y memory(addresses $FFCO-$FFFF - see Figure 6-12).6.3.5.3.7 Implicit ReferenceSome instructions make implicit reference to PC, SS, LA, LC, or SA. For example, thejump instruction (JMP) implicitly references the PC; whereas, the repeat next instruction(REP) impliCitly references LC. The registers implied and their uses are defined by theindividual instruction descriptions (see APPENDIX A - INSTRUCTION SET DETAILS).

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!