SpinAsm SOF

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