8051 Program - signed 8bit to 16bit conversion

; subroutine CONV816

; 8-bit Signed number to 16-Bit Signed number conversion

;

; input: r0 = X

;

; output: r1, r0 = X with sign extended to 16 bits

;

; alters: acc

CONV816:	mov A, r0
	jnb acc.7, Pos
	mov r1, #0FFH
	ret
Pos:	mov r1, #0
	ret

Source: Maths Subroutines for the 8051 microcontroller, W.G.Marshall 2002

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Related topics:
8051 Program - signed to unsigned conversion 8bit   |   8051 Program - signed to unsigned conversion 16bit   |   8051 Program - signed to unsigned conversion 32bit   |   8051 Program - unsigned to signed conversion 8bit   |   8051 Program - unsigned to signed conversion 16bit   |   8051 Program - unsigned to signed conversion 32bit   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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