HC705J2 datasheet(30/78 Pages) MOTOROLA

30 / 78 page

MC68HC705J2

CENTRAL PROCESSOR UNIT

MOTOROLA

4-11

4.3.8 Relative

The relative addressing mode is only for branch instructions and bit test and

branch instructions.

The CPU finds the conditional branch destination by

adding the signed byte following the opcode to the contents of the program

counter if the branch condition is true. If the branch condition is not true, the

CPU goes to the next instruction.

To permit branching either forward or

backward, the offset is a signed, two's complement byte that gives a branching

range of –127 to +128 bytes from the address of the next location after the

branch instruction.

When using the Motorola assembler, the programmer does not need to

calculate the offset, because the assembler determines the proper offset and

verifies that it is within the span of the branch. Table 4-6 lists the instructions

that use the relative addressing mode.

Table 4-6. Relative Addressing Instructions

Instruction

Mnemonic

Branch if Carry Clear

BCC

Branch if Carry Set

BCS

Branch if Equal

BEQ

Branch if Half-Carry Clear

BHCC

Branch if Half-Carry Set

BHCS

Branch if Higher

BHI

Branch if Higher or Same

BHS

Branch if Interrupt Line iHigh

BIH

Branch if Interrupt Line Low

BIL

Branch if Lower

BLO

Branch if Lower or Same

BLS

Branch if Interrupt Mask Clear

BMC

Branch if Minus

BMI

Branch if Interrupt Mask Set

BMS

Branch if Not Equal

BNE

Branch if Plus

BPL

Branch Always

BRA

Branch if Bit n Clear

BRCLR

Branch if Bit n Set

BRSET

Branch Never

BRN

Branch to Subroutine

BSR

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