Motorola DSP96002 - Manual (Page 231)

MOTOROLA DSP96002 USER’S MANUAL A - 43
BRCLR Branch if Bit Clear BRCLR
Operation:
If S{n} = 0, then PC + xxxx
→
PC
else PC + 1
→
PC
If S{n} = 0, then PC + xxxx
→
PC
else PC + 1
→
PC
If S{n} = 0, then PC + xxxx
→
PC
else PC + 1
→
PC
If S{n} = 0, then PC + xxxx
→
PC
else PC + 1
→
PC
If S{n} = 0, then PC + xxxx
→
PC
else PC + 1
→
PC
If S{n} = 0, then PC + xxxx
→
PC
else PC + 1
→
PC
If S{n} = 0, then PC + xxxx
→
PC
else PC + 1
→
PC
Assembler Syntax:
BRCLR #bit,X: ea, label
BRCLR #bit,X: aa, label
BRCLR #bit,X: pp, label
BRCLR #bit,Y: ea, label
BRCLR #bit,Y: aa, label
BRCLR #bit,Y: pp, label
BRCLR #bit,S,label
Description:
The nth bit in the source operand is tested. If the tested bit is cleared, program execution continues at
location PC+displacement. The PC contains the address of the next instruction. If the tested bit is set,
the PC is incremented and program execution continues sequentially. However, the address register spec-
ified in the effective address field is always updated independently of the condition. The displacement is
a 2’s complement 32-bit integer that represents the relative distance from the current PC to the destination
PC. The 32-bit displacement is contained in the extension word of the instruction. All memory alterable
addressing modes may be used to reference the source operand. Absolute Short, I/O Short and Register
Direct addressing modes may also be used. Note that if the specified source operand S is the SSH, the
stack pointer register will be decremented by one. The bit to be tested is selected by an immediate bit
number 0-31. See Section A.10 for restrictions.
CCR Condition Codes: Not affected.
ER Status Bits: Not affected.
IER Flags: Not affected.