Sonic Alert msm80154s Simplified Description of Instructions, Address in this description

234

Classifi- cation

Arithmetic operation instructions

Mnemonic				Instruction code						Byte	Cycle	Description		Page
		D7 D6 D5 D4 D3 D2 D1 D0
ADD	A, Rr	0	0	1	0	1	r2	r1	r0	1	1	(AC),(OV),(C),(A)←(A)+(Rr)	r=0~7	249
ADD	A, direct	0	0	1	0	0	1	0	1	2	1	(AC),(OV),(C),(A)←(A)+(direct address)		250
		a7 a6 a5 a4 a3 a2 a1 a0
ADD	A, @Rr	0	0	1	0	0	1	1	r	1	1	(AC),(OV),(C),(A)←(A)+((Rr))	r=0 or 1	248
ADD	A, #data	0	0	1	0	0	1	0	0	2	1	(AC),(OV),(C),(A)←(A)+#data		247
		I7 I6 I5 I4 I3 I2 I1 I0
ADDC	A, Rr	0	0	1	1	1	r2	r1	r0	1	1	(AC),(OV),(C),(A)←(A)+(C)+(Rr)	r=0~7	253
ADDC	A, direct	0	0	1	1	0	1	0	1	2	1	(AC),(OV),(C),(A)←(A)+(C)+(direct address)		254
		a7 a6 a5 a4 a3 a2 a1 a0
ADDC	A, @Rr	0	0	1	1	0	1	1	r	1	1	(AC),(OV),(C),(A)←(A)+(C)+((Rr))	r=0 or 1	252
ADDC	A, #data	0	0	1	1	0	1	0	0	2	1	(AC),(OV),(C),(A)←(A)+(C)+#data		251
		I7 I6 I5 I4 I3 I2 I1 I0
SUBB	A, Rr	1	0	0	1	1	r2	r1	r0	1	1	(AC),(OV),(C),(A)←(A)–((C)+(Rr))	r=0~7	359
SUBB	A, direct	1	0	0	1	0	1	0	1	2	1	(AC),(OV),(C),(A)←(A)–((C)+(direct address))		360
		a7 a6 a5 a4 a3 a2 a1 a0
SUBB	A, @Rr	1	0	0	1	0	1	1	r	1	1	(AC),(OV),(C),(A)←(A)–((C)+((Rr)))	r=0 or 1	358
SUBB	A, #data	1	0	0	1	0	1	0	0	2	1	(AC),(OV),(C),(A)←(A)–((C)+#data)		357
		I7 I6 I5 I4 I3 I2 I1 I0
MUL	AB	1	0	1	0	0	1	0	0	1	4	(AB)←(A)⋅(B)		335
DIV	AB	1	0	0	0	0	1	0	0	1	4	(A) quotient, (B) remainder ←(A)/(B)		284
DA	A	1	1	0	1	0	1	0	0	1	1	When the contents of accumulator bit 0 thru 3 exceed		278
												9, and when the auxiliary carry (AC) is 1, 6 is added to
												bits 0 thru 3. And if examination od bits 4 thru 7 shows
												that the result of adding the carry following correction of
												the lower order bits 0 thru 3 by 6 is in excess of 9, or
												carry (C) is 1, 6 is added to bits 4 thru 7. If a carry is
												generated as a result, 1 is set in the carry flag.

Note that “data address” is represented as “direct	7.4 Simplified Description of Instructions	MSM80C154S/83C154S/85C154HVS
address” in this description.