IA6805E2

29 August 2007

Microprocessor Unit

As of Production Version 00

Bit Manipulation Instructions:

The MPU is capable of altering any bits residing in the first 256 bytes of memory. An

additional feature allows the software to test and branch on the state of any bit within these

locations. For test and branch instructions the value of the bit tested is placed in the carry bit

of the condition code register.

Function

Mnemonic

n = 0…7

Branch if bit n set

BRSET n

Branch if bit n clear

BRCLR n

Set bit n

BSET n

Clear bit n

BCLR n

Branch Instructions:

If a specific condition is met, the instruction branches. If not, no operation is performed.

Function

Mnemonic

Branch always

BRA

Branch never

BRN

Branch if higher

BHI

Branch if lower or same

BLS

Branch if carry clear

BCC

Branch if higher or same

BHS

Branch if carry set

BCS

Branch if lower

BLO

Branch if not equal

BNE

Branch if equal

BEQ

Branch if half carry clear

BHCC

Branch if half carry set

BHCS

Branch if plus

BPL

Branch if minus

BMI

Branch if interrupt mask bit clear

BMC

Branch if interrupt mask bit set

BMS

Branch if interrupt line low

BIL

Branch if interrupt line high

BIH

Branch to subroutine

BSR

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