Intel mcs-48 manual 8021

8021

INSTRUCTION SET SUMMARY

	Mnemonic		Description	Bytes	Cycle		Mnemonic
	ADD	A,R	Add register to A		1		JMP	addr
	ADD	A,@R	Add data memory to A		1		JMPP	@A
	ADD	A.#data	Add immediate to A		2		DJNZ	R,addr
	ADDC	A,R	Add with carry		1	.<:	JC	addr
	ADDC	A,@R	Add with carry		1
						u	JNC	addr
	ADDC	A,#data	Add with carry	2	2	c
						E	JZ	addr
	ANL	A,R	And register to A	1	1
						'"	JNZ	addr
	ANL	A,@R	And data memory to A	1
	ANL	A, #data	And immediate to A	2			JT1	addr
							JNT1	addr
	ORL	A,R	Or register to A	1
							JTF	addr
	ORL	A,@R	Or data memory to A	1	1	~
:;~						.g
	ORL	A,#data	Or immediate to A		2
						~
E	XRL	A,R	Exclusive Or register to A			e	CALL	addr
~	XRL	A,@R	Exclusive or data memory to A			.c	RET
u						~
u	XRL	A,#dat8	Exclusive or immediate to A			en
«							CLR	C
	INC	A	Increment A			ri'
							CPL	C
	DEC	A	Decrement A
						ii:
	CLR	A	Clear A
							MOV	A,R
	CPL	A	Complement A
							MOV	A,@R
	DA	A	Decimal Adjust A
							MOV	A,#data
	SWAP	A	Swap nibbles of A
							MOV	R,A
	RL	A	Rotate A left			~
						>	MOV	@R,A
	RLC	A	Rotate A left through carry			0
						:;	MOV	R,#data
	RR	A	Rotate A right			!!
							MOV	@R,#data
	RRC	A	Rotate A right through carry
						0	XCH	A,R
	IN	A,P	I nput port to A				XCH	A,@R
',;							XCHD	A,@R
.'l-	OUTL	P,A	Output A to port				MOVP	A,@A
~
..,	MOVD	A,P	Input Expander port to A		2
0	MOVD	P,A	Output A to Expander port		2	~	MOV	A,T
~						c
Co	ANLD	P,A	And A to Expander port		2	~	MOV	T,A
!;	ORLD	P,A	Or A to Expander port		2	0	STRT	T
~						~
						~	STRT	CNT
~	INC	R	Increment register			E	STOP	TCNT
						;:
....	INC	@R	Increment data memory
~							NOP
a:

Description	Bytes	Cycle
Jump unconditional	2	2
Jump indirect	1	2
Decrement register and Jump	2	2
on R not zero
Jump on Carry = 1	2	2
Jump on Carry"" a	2	2
Jump on A Zero	2	2
Jump on A not Zero	2	2
Jump on Tl '" 1	2	2
Jump on Tl =- 0	2	2
Jump on timer flag	2	2
Jump to subroutine	2	2
Return	1	2
Clear Carry
Complement Carry
Move register to A
Move data memory to A
Move immediate to A		2
Move A to register		1
Move A to data memory		1
Move immediate to register		2
Move immediate to data memory		2
Exchange A and register		,
Exchange A and data memory		2
Exchange nibble of A and register 1		1
Move to A from cu rrent page	1	2

Read Timer/Counter

Load Timer/Counter

Start Timer

Start Counter

Stop Timer/Counter

No Operation

Instruction Set - The following instructions, which are found in the 8748, have been deleted from the 8021 instruction set.

Data Moves		Registers		Branch		Timer		Control		Input/Output
MOV	A,PSW	DEC	R	JTO	addr	EN	TCNTI	EN	I	ANL	P,#data
MOV	PSW,A I ---JNTO				addr	DIS	TCNTI	DIS	I	ORL	P,#data
MOVX	A,@R	Flags		JFO	addr			SEL	RBO	INS	A,BUS *
MOVX	@R,A	~ JFl			addr Subroutine			SEL	RBl OUTl		BUS,A *
MOVP3	A,@A	CPl	FO	JNI	addr	RETR		SEL	MBa	ANL	BUS,#data
				JBb	addr			SEL	MBl	ORL	BUS,#data
		CLR	Fl
								ENTO ClK
		CPL	Fl

"These Instructions have been replaced in the 8021 by

IN A,PO and OUTL PO,A respectively.

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