SpinAsm SOF: Difference between revisions
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(Created page with "== 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...") |
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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. | ||
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Revision as of 20:53, 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.
| 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