NAME |
ROXL, ROXR -- Rotate left with extend and rotate right with extend |
SYNOPSIS |
ROXd | Dx,Dy |
ROXd | #<data>,Dy |
ROXd | <ea> |
where d is direction, L or R
Size = (Byte, Word, Long)
|
FUNCTION |
A rotation is made on destination operand bits.
Rotation uses bit X.
| . | -------->----------- | . |
ROXL: | | | | | |
| C | <------ OPERAND <- X -- | '
| | | <--- | |
ROXR: | , | ---------<------- | . |
| | | | | |
| ` | -- X -> OPERAND -----> | C |
| | ---> | |
|
FORMAT |
In the case of the rotating of a register:
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
1 | 1 | 1 | 0 | NUMBER/REGISTER | dr | SIZE | i/r | 1 | 0 | REGISTER |
In the case of the rotating of a memory area:
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
1 | 1 | 1 | 0 | 0 | 1 | 0 | dr | 1 | 1 | MODE | REGISTER |
| <ea> |
|
NUMBER/REGISTER |
Specifies number of rotating or number of register which contents
the number of rotating.
If i/r = 0, number of rotating is specified in the instruction as
immediate data
If i/r = 1, it's specified in the data register.
If dr = 0, right rotating
If dr = 1, left rotating
|
SIZE |
00 | -> | one Byte operation |
01 | -> | one Word operation |
10 | -> | one Long operation |
|
REGISTER |
For a register rotating:
Indicates the number of data register on which rotating is applied.
For a memory rotating:
<ea> indicates operand which should be rotated.
Only addressing modes relatives to memory are allowed:
Addressing Mode | Mode | Register |
Dn | - | - |
An | - | - |
(An) | 010 | No reg. An |
(An)+ | 011 | No reg. An |
-(An) | 100 | No reg. An |
(d16,An) | 101 | No reg. An |
(d8,An,Xi) | 110 | No reg. An |
(bd,An,Xi) | 110 | No reg. An |
([bd,An,Xi]od) | 110 | No reg. An |
([bd,An],Xi,od) | 110 | No reg. An |
|
Addressing Mode | Mode | Register |
Abs.W | 111 | 000 |
Abs.L | 111 | 001 |
(d16,PC) | - | - |
(d8,PC,Xi) | - | - |
(bd,PC,Xi) | - | - |
([bd,PC,Xi],od) | - | - |
([bd,PC],Xi,od) | - | - |
#data | - | - |
|
|
RESULT |
X | - | Set by the last bit out of operand. Not changed if rotation is zero. |
N | - | Set if the result is negative. Cleared otherwise. |
Z | - | Set if the result is zero. Cleared otherwise. |
V | - | Always cleared |
C | - | Set according to the last bit shifted out of the operand. |
|