FV1Dev and SpinAsm SOF: Difference between pages
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== SOF == | |||
{| class="wikitable" | |||
|+ | |||
!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 ====== | |||
{| class="wikitable" | |||
|+ | |||
!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> | |||
Latest 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
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