Bit SET
NAME
BSET -- Bit set
SYNOPSIS
BSET Dn,<ea>
BSET #<data>,<ea>
Size = (Byte, Long)
FUNCTION
Tests a bit in the destination operand and sets the Z condition code
appropriately, then sets the bit in the destination.
If the destination is a data register, any of the 32 bits can be
specifice by the modulo 32 number. When the distination is a memory
location, the operation must be a byte operation, and therefore the
bit number is modulo 8. In all cases, bit zero is the least
significant bit. The bit number for this operation may be specified
in either of two ways:
1. Immediate -- The bit number is specified as immediate data.
2. Register -- The specified data register contains the bit number.
FORMAT
In the case of BSET Dn,<ea>:
~~~~~~~~~~~~~~~~~~~~~~~~~~~
-----------------------------------------------------------------
|15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|-----------|---|---|---|-----------|-----------|
| 0 | 0 | 0 | 0 | REGISTER | 1 | 1 | 1 | MODE | REGISTER |
----------------------------------------=========================
<ea>
In the case of BSET #<data,<ea>:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<ea>
----------------------------------------=========================
|15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|-----------|-----------|
| 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | MODE | REGISTER |
|---|---|---|---|---|---|---|---|-------------------------------|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | NUMBER OF THE BIT |
-----------------------------------------------------------------
REGISTER
<ea> is always destination, addressing modes are the followings:
--------------------------------- -------------------------------
|Addressing Mode|Mode| Register | |Addressing Mode|Mode|Register|
|-------------------------------| |-----------------------------|
| Dn * |000 |N° reg. Dn| | Abs.W |111 | 000 |
|-------------------------------| |-----------------------------|
| An | - | - | | Abs.L |111 | 001 |
|-------------------------------| |-----------------------------|
| (An) |010 |N° reg. An| | (d16,PC) | - | - |
|-------------------------------| |-----------------------------|
| (An)+ |011 |N° reg. An| | (d8,PC,Xi) | - | - |
|-------------------------------| |-----------------------------|
| -(An) |100 |N° reg. An| | (bd,PC,Xi) | - | - |
|-------------------------------| |-----------------------------|
| (d16,An) |101 |N° reg. An| |([bd,PC,Xi],od)| - | - |
|-------------------------------| |-----------------------------|
| (d8,An,Xi) |110 |N° reg. An| |([bd,PC],Xi,od)| - | - |
|-------------------------------| |-----------------------------|
| (bd,An,Xi) |110 |N° reg. An| | #data | - | - |
|-------------------------------| -------------------------------
|([bd,An,Xi]od) |110 |N° reg. An|
|-------------------------------|
|([bd,An],Xi,od)|110 |N° reg. An|
---------------------------------
* Long only; for others modes: Byte only.
RESULT
X - not affected
N - not affected
Z - Set if the bit tested is zero. Cleared otherwise.
V - not affected
C - not affected
SEE ALSO
BCHG BCLR BTST
OR BFSET BFINS
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& witbrock@cs.cmu.edu