8051 Program – 16bit random number generator

; generates a 16 bit pseudo-random number which is returned in Acc (lsb) & B (msb)
; two bytes of memory must be available for rand16reg
	ORG 0H
	rand16reg EQU 40H	;two bytes
rand16:	MOV A, rand16reg
	JNZ rand16b
	MOV A, rand16reg+1
	JNZ rand16b
	CPL A
	MOV rand16reg, A
	MOV rand16reg+1, A
rand16b:	ANL A, #11010000b
	MOV C, P
	MOV A, rand16reg
	JNB ACC.3, rand16c
	CPL C
rand16c:	RLC A
	MOV rand16reg, A
	MOV B, A
	MOV A, rand16reg+1
	RLC A
	MOV rand16reg+1, A
	XCH A, B
	RET
	END

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List of topics: 8051

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