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UM018809-0611 Instruction Opcodes

ZNEO

CPU Core

User Manual

Instruction Opcodes

This chapter provides a complete list of ZNEO CPU instruction opcodes.

Each instruction opcode listed in this chapter consists of one, two or three 16-bit words. To

abbreviate the listing, certain bit positions are represented symbolically by function.

Table 16 lists the bit field symbols used.

Table 17 lists the abbreviations used in place of register names or explicit values in this

chapter. Normal assembly syntax for operands is described in the Operand Addressing

chapter on page 27.

Table 16. Bit Field Symbols

Bit Character Meaning

1 Literal 1 bit.

0 Literal 0 bit.

o Binary operation (BOP) number: 000B=ADD, 001B=SUB, 010B=AND,

011B=OR, 100B=XOR, 101B=CP, 110B=TM, 111B=TCM.

Unary operation (UOP) number: 00B=CLR, 01B=CPZ, 10B=INC, 11B=DEC.

d Destination register number.

s Source register number.

m Register mask for PUSHM, POPM.

i Immediate operand bits.

c Condition code.

r Relative offset (in Words).

v Vector number.

w Select Word or Quad (0=16, 1=32 bits)

b Select Byte or Word (0=8 bits, 1=16 bits)

z Select extension (0=Unsigned, 1=Signed)

+ Select pointer predecrement or postincrement.

For a destination pointer: 0=predecrement, 1=postincrement.

For a source pointer: 0=no increment, 1=postincrement

x Don't care digit (ignored by CPU).

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 215 216

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