SpinAsm SOF: Difference between revisions
| Line 37: | Line 37: | ||
====== Coding Example ====== | ====== Coding Example ====== | ||
<code> | |||
Off EQU 1.0 ; | Off EQU 1.0 ; | ||
; | ; | ||
| Line 44: | Line 45: | ||
sof 1.0,Off ; Subtract offset | sof 1.0,Off ; Subtract offset | ||
sof 1.0,Off ; Add offset | sof 1.0,Off ; Add offset | ||
</code> | |||
Revision as of 13:44, 22 November 2024
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