Entry condition: The operand is in [R0].
Exit information: When OV=0, the result is still in [R0]. When OV=1, overflow occurs.
Affected resources: PSW, A, B, R2~R7, bits 1EH, 1FH Stack requirement: 5 bytes
FRCP: MOV A,@R0
MOV C,ACC.7
MOV 1FH,C ; Save the number sign
MOV C,ACC.6 ; Transfer the absolute value to the second work area
MOV ACC.7,C
MOV R5,A
INC R0
MOV A,@R0
MOV R6,A
INC R0
MOV A,@R0
MOV R7,A
DEC R0
DEC R0
ORL A,R6
JNZ RCP
SETB OV ; Zero cannot be inverted, set the overflow flag
RET
RCP: MOV A,R6
JB ACC.7,RCP2; Is the operand formatted?
CLR C ; format
MOV A,R7
RLC A
MOV R7,A
MOV A,R6
RLC A
MOV R6,A
DEC R5
SJMP RCP
RCP2: MOV R2,#1 ; transfer the value 1.00 to the first work area
MOV R3,#80H
MOV R4,#0
LCALL DIV3 ; call the work area floating point division to get the reciprocal
LJMP MOV0 ; return the result
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MSP430 Study Notes
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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