CDP1806ACE datasheet(17/30 Pages) INTERSIL

17 / 30 page

Instruction Set

The CDP1805AC and CDP1806AC instruction summary is

given in Table 1. Hexadecimal notation is used to refer to the

4-bit binary codes.

In all registers, bits are numbered from the least significant

bit (LSB) to the most significant bit (MSB) starting with 0.

R(W): Register designated by W, where

W = N or X, or P

R(W).0: Lower-order byte of R(W)

R(W).1: Higher-order byte of R(W)

Operation Notation

M (R(N))

→ D; R(N) + 1 → R(N)

This notation means: The memory byte pointed to by R(N) is

loaded into D, and R(N) is incremented by 1.

TABLE 1. INSTRUCTION SUMMARY (SEE NOTES)

INSTRUCTION

NO. OF

MACHINE

CYCLES

MNEMONIC

OP CODE

OPERATION

MEMORY REFERENCE

LOAD IMMEDIATE

LDI

M(R(P))

→ D; R(P) + 1 → R(P)

RLDI

68CN

(Note 10)

M(R(P))

→ R(N).1; M(R(P)) + 1 →

R(N).0; R(P) + 2

→ R(P)

LOAD VIA N

LDN

M(R(N))

→ D; FOR N NOT 0

LOAD ADVANCE

LDA

M(R(N))

→ D; R(N) + 1 → R(N)

LOAD VIA X

LDX

M(R(X))

→ D

LOAD VIA X AND ADVANCE

LDXA

M(R(X))

→ D; R(X) + 1 → R(X)

ADVANCE

RLXA

686N

(Note 10)

M(R(X))

→ R(N).1; M(R(X) + 1) →

R(N).0; R(X)) + 2

→ R(X)

STORE VIA N

STR

→ M(RN))

STORE VIA X AND DECREMENT

STXD

→ M(R(X)); R(X) - 1 → R(X)

DECREMENT

RSXD

68AN

(Note 10)

R(N).0

→ M(R(X)); R(N).1 →

M(R)(X) - 1); R(X) - 2

→ R (X)

INCREMENT REG N

INC

R(N) + 1

→ R(N)

DECREMENT REG N

DEC

R(N) - 1

→ R(N)

DECREMENT REG N AND LONG

BRANCH IF NOT EQUAL 0

DBNZ

682N

R(N) - 1

→ R(N); IF R(N) NOT 0,

M(R(P))

→ R(P).1, M(R(P) + 1) →

R(P).0, ELSE R(P) + 2

→ R(P)

INCREMENT REG X

IRX

R(X) + 1

→ R(X)

GET LOW REG N

GLO

R(N).0

→ D

PUT LOW REG N

PLO

→ R(N).0

GET HIGH REG N

GHI

R(N).1

→ D

PUT HIGH REG N

PHI

→ R(N).1

COPY

RNX

68BN

(Note 10)

R(N)

→ R(X)

LOGIC OPERATIONS (Note 19)

M(R(X)) OR D

→ D

OR IMMEDIATE

ORI

M(R(P)) OR D

→ D; R(P) + 1 → R(P)

EXCLUSIVE OR

XOR

M(R(X)) XOR D

→ D

EXCLUSIVE OR IMMEDIATE

XRI

M(R(P)) XOR D

→ D;

R(P) + 1

→ R(P)

AND

M(R(X)) AND D

→ D

CDP1805AC, CDP1806AC

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