Table of Contents
Previous topic Next topic
MICROPROCESSOR INSTRUCTION REFERENCE->BSET
BSET Test a Bit and Set
Compatibility: 68000, 68010, 68020, CPU32 families
Complement of (<bit no.> Destination) -> Z
1 -> (<bit no.> Destination)
Assembler Syntax: | BSET Dn,<ea> |
| BSET #<data>,<ea> |
Dn or #<data> specify the bit no. and <ea> may be data alterable only
Size: Byte, Long
If <ea> is Data register then #<data> 0 - 31 else #<data> 0 - 7
Tests a bit in the destination operand and sets the Z condition code appropriately. Then sets the specified bit in the destination operand. When a data register is the destination, any of the 32 bits can be specified by a modulo 32-bit number. When a memory location is the destination, the operation is a byte operation, and the bit number is modulo 8. In all cases, bit zero refers to the least significant bit.
Condition Codes:
N Not affected
Z Set if bit tested = 0, else clear
V Not affected
C Not affected
X Not affected
| Allowable Addressing Modes |
|
| BSET | Dn,Dn | BSET | #(data),Dn |
| BSET | Dn,(An) | BSET | #(data),(An) |
| BSET | Dn,(An)+ | BSET | #(data),(An)+ |
| BSET | Dn,-(An) | BSET | #(data),-(An) |
| BSET | Dn,(d16,An) | BSET | #(data),(d16,An) |
| BSET | Dn,(d8,An,Xn) | BSET | #(data),(d8,An,Xn) |
| BSET | Dn,(bd,An,Xn) 2 | BSET | #(data),(bd,An,Xn) 2 |
| BSET | Dn,([bd,An,Xn],od) 1 | BSET | #(data),([bd,An,Xn],od) 1 |
| BSET | Dn,([bd,An],Xn,od) 1 | BSET | #(data),([bd,An],Xn,od) 1 |
| BSET | Dn,(xxx).W | BSET | #(data),(xxx).W |
| BSET | Dn,(xxx).L | BSET | #(data),(xxx).L |
Dn,Dn and #(data),Dn are long only; all others are byte only.
1 68020 only
2 68020 and CPU32 only