SpinAsm SOF: Difference between revisions
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====== Description ====== | ====== Description ====== | ||
SOF will multiply the current value in ACC with C and will then add the constant D to the result. Please note the absence of an integer entry format for D. This is not by mistake but it should emphasize that D is not intended to become used for integer arithmetic. The reason for this instruction is that the 11 bit constant D would be placed into ACC left justified or in other words 13 bits shifted to the left. D is intended to offset ACC by a constant in the range from –1 to +0.9990234375. | SOF will multiply the current value in ACC with C and will then add the constant D to the result. Please note the absence of an integer entry format for D. This is not by mistake but it should emphasize that D is not intended to become used for integer arithmetic. The reason for this instruction is that the 11 bit constant D would be placed into ACC left justified or in other words 13 bits shifted to the left. D is intended to offset ACC by a constant in the range from –1 to +0.9990234375. | ||
====== Parameters ====== | |||
{| class="wikitable" | {| class="wikitable" | ||
|+ | |+ | ||
!Name | !Name | ||
!Width | !Width | ||
Revision as of 20:54, 6 January 2023
SOF
| Mnemonic | Operation | Instruction coding |
|---|---|---|
| SOF | C * ACC + D | CCCCCCCCCCCCCCCCDDDDDDDDDDD01101 |
Description
SOF will multiply the current value in ACC with C and will then add the constant D to the result. Please note the absence of an integer entry format for D. This is not by mistake but it should emphasize that D is not intended to become used for integer arithmetic. The reason for this instruction is that the 11 bit constant D would be placed into ACC left justified or in other words 13 bits shifted to the left. D is intended to offset ACC by a constant in the range from –1 to +0.9990234375.
Parameters
| Name | Width | Entry formats, range |
|---|---|---|
| C | 16 Bit | Real (S1.14)
Hex ($0000 $FFFF) Symbolic |
| D | 11 Bit | Real(S.10)
Symbolic |
Syntax
SOF C,D
Coding Example
<syntaxhighlight line="1"> Off EQU 1.0 ;
;
- Halve way rectifier
sof 0,0 ; Clear ACC rdax ADCL,1.0 ; Read from left ADC channel sof 1.0,Off ; Subtract offset sof 1.0,Off ; Add offset </syntaxhighlight>