Motorola M68000 User Manual download pdf (Page 66)

Integer Instructions

MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 4-25

Bcc Branch Conditionally Bcc

(M68000 Family)

Operation: If Condition True

Then PC + d

→ PC

Assembler

Syntax: Bcc < label >

Attributes: Size = (Byte, Word, Long*)

*(MC68020, MC68030, and MC68040 only)

Description: If the speciﬁed condition is true, program execution continues at location (PC)

+ displacement. The program counter contains the address of the instruction word for

the Bcc instruction plus two. The displacement is a twos-complement integer that

represents the relative distance in bytes from the current program counter to the

destination program counter. If the 8-bit displacement ﬁeld in the instruction word is

zero, a 16-bit displacement (the word immediately following the instruction) is used. If

the 8-bit displacement ﬁeld in the instruction word is all ones ($FF), the 32-bit

displacement (long word immediately following the instruction) is used. Condition code

cc speciﬁes one of the following conditional tests (refer to Table 3-19 for more

information on these conditional tests):

Condition Codes:

Not affected.

Mnemonic Condition Mnemonic Condition

CC(HI) Carry Clear LS Low or Same

CS(LO) Carry Set LT Less Than

EQ Equal MI Minus

GE Greater or Equal NE Not Equal

GT Greater Than PL Plus

HI High VC Overflow Clear

LE Less or Equal VS Overflow Set

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Motorola M68000 User Manual Page 66