INC¶

INC M

Increment

Description

Increments M by 1.

M += 1

Results

Register/Flag	8-bit	16-bit (non-ADL)
`M`	Set to the result of `M + 1`
`S` flag	Set if the result is negative; else reset	Not affected
`Z` flag	Set if the result is 0; else reset	Not affected
`H` flag	Set if carry from bit 3; else reset	Not affected
`P/V` flag	Set if `M` was $7F before operation; else reset	Not affected
`N` flag	Reset	Not affected
`C` flag	Not affected

Allowed Instructions

Instruction	Opcode	CC (ADL/non-ADL)	CC (.S)	CC (.L)
inc a	$3C	1F	X	X
inc b	$04	1F	X	X
inc c	$0C	1F	X	X
inc d	$14	1F	X	X
inc e	$1C	1F	X	X
inc h	$24	1F	X	X
inc l	$2C	1F	X	X
inc ixh	$DD, $24	2F	X	X
inc ixl	$DD, $2C	2F	X	X
inc iyh	$FD, $24	2F	X	X
inc iyl	$FD, $2C	2F	X	X
inc (hl)	$34	1F + 1R + 1W + 1	2F + 1R + 1W + 1	2F + 1R + 1W + 1
inc (ix+n)	$DD, $34, n	3F + 1R + 1W + 1	4F + 1R + 1W + 1	4F + 1R + 1W + 1
inc (iy+n)	$FD, $34, n	3F + 1R + 1W + 1	4F + 1R + 1W + 1	4F + 1R + 1W + 1
inc bc	$ED, $0B	1F	2F	2F
inc de	$ED, $1B	1F	2F	2F
inc hl	$ED, $23	1F	2F	2F
inc sp	$ED, $3B	1F	2F	2F
inc ix	$DD, $23	2F	3F	3F
inc iy	$ED, $23	2F	3F	3F

Notes

Keep in mind that the flags are not altered when using this instruction with a 16-bit and 24-bit operand.

See Also

DEC