GXM datasheet(212/244 Pages) NSC

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Instruction Set (Continued)

9.3

PROCESSOR CORE INSTRUCTION SET

The instruction set for the GXm processor core is summa-

rized in Table 9-27 on page 213. The table uses several

symbols and abbreviations that are described next and

listed in Table 9-26.

Opcodes

Opcodes are given as hex values except when they

appear within brackets as binary values.

Clock Counts

The clock counts listed in the instruction set summary

table are grouped by operating mode (Real and Pro-

tected) and whether there is a register/cache hit or a

cache miss. In some cases, more than one clock count is

showninacolumnfor agiven instruction, or avariableis

used in the clock count.

Flags

There are nine flags that are affected by the execution of

instructions. The flag names have been abbreviated and vari-

ous conventions used to indicate what effect the instruc-

tion has on the particular flag.

Table 9-26. Processor Core Instruction Set

Table Legend

Symbol or

Abbreviation

Description

Opcode

Immediate 8-bit data

Immediate 16-bit data

###

Full immediate 32-bit data (8, 16, 32 bits)

8-bit signed displacement

+++

Full signed displacement (16, 32 bits)

Clock Count

Number of times operation is repeated.

Level of the stack frame.

Conditional jump taken | Conditional jump not

taken.

(e.g. “4|1” = 4 clocks if jump taken, 1 clock if

jump not taken)

\CPL

≤ IOPL \ CPL > IOPL

(where CPL = Current Privilege Level, IOPL =

I/O Privilege Level)

Flags

Overflow Flag

Direction Flag

Interrupt Enable Flag

Trap Flag

Sign Flag

Zero Flag

Auxiliary Flag

Parity Flag

Carry Flag

Flag is modified by the instruction.

Flag is not changed by the instruction.

Flag is reset to “0”.

Flag is set to “1”.

Flag is undefined following execution the

instruction.

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