1989_MELPS_7700_Software_Manual

CLB
Clear Bit
CLB
Operation
M (- MA IMM
IMM is the bit pattern that specifies the bit positions that are to be cleared to O.
The bit positions that are to be cleared are indicated by 1 in IMM, and the bit positions
that are not to be cleared are indicated by 0 in IMM.
When the data length selection flag m is set to 1, IMM is placed in the third byte
(direct bit addressing mode) or the fourth byte (absolute bit addressing mode) of
the instruction.
'
When the data length selection flag m is set to 0, IMM is placed in the third and
fourth bytes (direct bit addressing mode) or the fourth and fifth bytes (absolute bit
addressing mode) of the instruction.
Description
The CLB instruction clears the specified memory bits to O.
cleared can be specified at one time.
Multiple bits to be
Status flags
Not affected.
Addressing mode Syntax Machine code Bytes Cycles
Direct bit CLB #imm, dd 1416, dd, imm 3 8
Absolute bit CLB #imm, mmll 1C16, II, mm, imm 4 9
(Note1) The bytes-count Increases by 1 when operating on 16-blt data with the data length selecllon
flag m set to O.
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