SX28ACSLASHSS datasheet(35/51 Pages) PARALLAX

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Parallax SX20AC/SX28AC

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Rev 1.6 11/20/2006

16.0 NATIVE SX INSTRUCTION SET SUMMARY TABLES

Table 16-1 through Table 16-6 list all of the native

assembly instructions, organized by category. For each

instruction, the table shows the instruction mnemonic (as

written in assembly language), a brief description of what

the instruction does, the number of instruction cycles

required for execution, the binary opcode, and the status

bits affected by the instruction.

The “Clock Cycles (Turbo)” column typically shows a

value of 1, which means that the overall throughput for

the instruction is one per clock cycle. Exceptions include

program control branch instructions, which take 3 clock

cycles, and the system control instruction IREAD, which

takes 4.

In some cases, the exact number of cycles depends on the

outcome of the instruction (such as the test-and-skip

instructions) or the clocking mode (Slow or Turbo). In

those cases, all possible numbers of cycles are shown in

the table. The instruction execution time is derived by

dividing the oscillator frequency by either one (Turbo

mode) or four (Slow). The divide-by factor is selected

through the FUSE Word register.

A superset of these instructions are available in the SASM

assembler of the SX-Key IDE, and supported by the SX

Key User’s Manual. Both are available for free download

from www.parallax.com/sx.

Table 16-1: Native SX Instruction Set: Logical Operands

Mnemonic,

Operands

Description

Clock Cycles

(Slow Mode)

Clock Cycles

(Turbo)

Opcode

Bits

Affected

AND fr,W

AND of fr and W into fr (fr = fr & W)

0001 011f ffff

AND W,fr

AND of W and fr into W (W = W & fr)

0001 010f ffff

AND W,#lit

AND of W and Literal into W (W = W &b lit)

1110 kkkk kkkk

NOT fr

Complement of fr into fr (fr = fr ^ FFh)

0010 011f ffff

OR fr,W

OR of fr and W into fr (fr = fr | W)

0001 001f ffff

OR W,fr

OR of W and fr in to fr (W – W | fr)

0001 000f ffff

OR w,#lit

Or of W and Literal into W (W = W | lit)

1101 kkkk kkkk

XOR fr,W

XOR of fr and W into fr (fr = fr ^ W)

0001 101f ffff

XOR W,fr

XOR of W and fr into W (W = W ^ fr)

0001 100f ffff

XOR W,#lit

XOR of W and Literal into W (W = W ^ lit)

1111 kkkk kkkk

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