CDP1805ACE datasheet(19/30 Pages) INTERSIL

19 / 30 page

DECIMAL SUBTRACT MEMORY

WITH BORROW, IMMEDIATE

DSBI

687F

D - M(R(P)) - (NOT DF)

→ DF, D

R(P) + 1

→ R(P)

DECIMAL ADJUST

→ DF, D

BRANCH INSTRUCTIONS - SHORT BRANCH

SHORT BRANCH

M(R(P))

→ R(P).0

NO SHORT BRANCH (See SKP)

NBR

(Note 11)

R(P) + 1

→ R(P)

SHORT BRANCH IF D = 0

IF D = 0, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF D NOT 0

BNZ

IF D NOT 0, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF DF = 1

BDF

(Note 11)

IF DF = 1, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF POS OR ZERO

BPZ

(Note 11)

IF DF = 1, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF EQUAL OR

GREATER

2BGE

(Note 11)

IF DF = 1, M(R(P))

→ R(P).0,

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF DF = 0

BNF

(Note 11)

IF D = 0, M(R(P))

→ R(P).0,

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF MINUS

(Note 11)

IF D = 0, M(R(P))

→ R(P).0,

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF LESS

(Note 11)

IF D = 0, M(R(P))

→ R(P).0,

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF Q = 1

IF Q = 1, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF Q = 0

BNQ

IF Q = 0, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF EF1 = 1

(EF1 = VSS)

IF EF1 = 1, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF EF1 = 0

(EF1 = VDD)

BN1

IF EF1 = 0, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF EF2 = 1

(EF2 = VSS)

IF EF2 = 1, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF EF2 = 0

(EF2 = VDD)

BN2

IF EF2 = 0, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF EF3 = 1

(EF3 = VSS)

IF EF3 = 1, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF EF3 = 0

(EF3 = VDD)

BN3

IF EF3 = 0, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF EF4 = 1

(EF4 = VSS)

IF EF4 = 1, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH IF EF4 = 0

(EF4 = VDD)

BN4

IF EF4 = 0, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

SHORT BRANCH ON COUNTER

INTERRUPT

BCI

683E

(Note 12)

IF CI = 1, M(R(P))

→ R(P).0; 0 → CI

ELSE R(P) + 1

→ R(P)

SHORT BRANCH ON EXTERNAL

INTERRUPT

BXI

683F

IF XI = 1, M(R(P))

→ R(P).0

ELSE R(P) + 1

→ R(P)

TABLE 1. INSTRUCTION SUMMARY (SEE NOTES) (Continued)

INSTRUCTION

NO. OF

MACHINE

CYCLES

MNEMONIC

OP CODE

OPERATION

CDP1805AC, CDP1806AC

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