6F3B0253
7. Instructions
FUN 071
SHL
n bit shift left
Expression
Input − [ A SHL n → B ]− Output
Function
When the input is ON, the data of register A is shifted n bits to the left (MSB direction) including the carry flag (CF = S050), and stored in B. 0 is stored in lower n bits. After the operation, if the left most bit (MSB) is ON, the output is turned ON.
Execution condition
Input |
| Operation | Output | CF |
OFF | No execution | OFF | − | |
ON | Execution | When MSB = 1 | ON | Set or reset |
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| When MSB = 0 | OFF | Set or reset |
Operand
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| Constant | Index | ||
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| X | Y | R | S | T. | C. | XW | YW | RW | SW | T | C | D | I | J | K |
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A | Source |
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| √ | √ | √ | √ |
| √ | √ | √ | √ | √ | √ | √ | √ |
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n | Shift bits |
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| 1 - 16 |
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B | Destination |
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| √ |
| √ | √ | √ | √ | √ | √ | √ | √ |
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Example
When X008 is changed from OFF to ON, the data of RW18 is shifted 3 bits to the left and the result is stored in RW20.
The figure below shows an operation example.
CF 1
(MSB) |
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| (LSB) |
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| F E D C B A 9 8 7 6 5 4 3 2 1 0 |
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| 1 |
| 0 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 1 |
| 0 |
| RW18 |
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| RW20 (Result) | ||
| 0 |
| 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 |
| 0 |
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R002 is turned OFF | 0 |
Basic Hardware and Function 167
