Samsung S3F80JB Cpijne Compare, Increment, and Jump on Non-Equal, If dst src 0, PC ← PC + RA

INSTRUCTION SETS3F80JB

CPIJNE — Compare, Increment, and Jump on Non-Equal

CPIJNE	dst,src,RA
Operation:	If dst – src "0", PC ← PC + RA
	Ir ← Ir + 1
	The source operand is compared to (subtracted from) the destination operand. If the result is not
	"0", the relative address is added to the program counter and control passes to the statement
	whose address is now in the program counter; otherwise the instruction following the CPIJNE
	instruction is executed. In either case the source pointer is incremented by one before the next
	instruction.

Flags: No flags are affected.

Format:

opc src dst RA

Bytes	Cycles	Opcode	Addr Mode
		(Hex)	dst	src
3	12	D2	r	Ir

NOTE: Execution time is 18 cycles if the jump is taken or 16 cycles if it is not taken.

Example: Given: R1 = 02H, R2 = 03H, and register 03H = 04H:

CPIJNER1,@R2,SKIP → R2 = 04H, PC jumps to SKIP location

Working register R1 contains the value 02H, working register R2 (the source pointer) the value 03H, and general register 03 the value 04H. The statement "CPIJNE R1,@R2,SKIP" subtracts 04H (00000100B) from 02H (00000010B). Because the result of the comparison is non-equal, the relative address is added to the PC and the PC then jumps to the memory location pointed to by SKIP. The source pointer register (R2) is also incremented by one, leaving a value of 04H. (Remember that the memory location must be within the allowed range of + 127 to – 128.)

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