Intel mcs-48 manual Ale, XTAL2

8021~!m[§!!"U~UOO~!mW

PIN DESCRIPTION

Designation

Vss

Vee

PROG

POO-P07 port 0

Pin # Function

14Circuit GND potential

28+5V power supply

3Output strobe for 8243 1/0 Expander

4-11 8-bit quasi-bidirectional port

Designation	Pin #	Function
		CNT instruction. Also allows
		zero-crossover sensing of
		slowly moving inputs.
RESET	17	Input used to initialize the proc-
		essor by clearing status flip-
		flops and setting program
		counters to zero.

P10-P17	18-25	8-bit quasi-bidirectional port
Port 1
P20-P23	26-27	4-bit quasi-bidirectional port
Port 2	1-2 P20-P23 also serve as a 4-bit
		110 expander bus for 8243
T1	13	Input pin testable using the JT 1
		and JNT1 instructions. Can be
		designated the timer I event
		counter input using the STRT

ALE	12	Address Latch, Enable. Signal
		occurring once every 30 input
		clocks, used as an output
		clock.
XTAL1	15	One side of crystal or inductor
		input for internal oscillator. Also
		input for external source. (Not
		TTL compatible.)
XTAL2	16	Other side of timing control
		element.

INSTRUCTION SET

Mnemonic Description

Hexadecimal

Byte. Cycle Opcode

Mnemonic

Description	Byte. Cycl.	Hexadecimal
		Opcode

ADD A,R r

ADD A,@R

ADD A,#data

ADDC A,Rr

ADDCA,@R

ADDC A,#data

ANL A,Rr ANL A,@R ANL A,#data ORL A,R r

j ORL A,@R ORL A,#data

"E XRL A,Rr

"

"

c" XRL A,@R

XRL A,#data

INC A

DEC A

CLR A

CPL A

OAA

SWAP A

RL A

RLC A

RRA

RRC A

IN A, Pp

'5OUTLP A

f MOVO x.Pp

0:s MOVO Pp,A

!

ANLO Pp,A

ORLO Pp,A

j INCRr

IINC@R

!

Add register to A

Add data memory to A Add immediate to A Add register with carry Add data memory with

carry

Add immediate with carry

And register to A

And data memory to A And immediate to A Or register to A

Or data memory to A Or immediate to A

Exclusive Or register

to A Exclusive Or data

memory to A Exclusive Or immediate

to A Increment A Decrement A Clear A Complement A O~cimal adjust A Swap nibbles of A Rotate A left Flotate A left through

carry Rotate A right

Rotate A right through carry

Input port to A Output A to port Input expander port

to A

Output A to expander port

And A to expander port Or A to expander port

Increment register Increment data memory

6S'6F

11 60-61

2 2 03 7S·7F 70-71

2 2 13

5S-5F 50·51

253 4S·4F

140·41

2 2 43 DS·OF

00·01

203

17

07

27

37·

57

-I47 E7 F7

77

67

OS,09.0A

290,39,3A

2OC-OF

2 3C·3F

29C·9F

2SC·SF

IS-IF 10·11

JMP addr

JMPP@A

... DJNZ R,o addr

"c

~JC addr JNC addr

JZ addr JNZ addr JT1 addr JNTI addr JTF addr

•

:Ii CALL addr

g

..g RET

i CLRC it CPL C

MOVA,Rr MOVA,@R MOV A,#data MOV Rr,A MOV@R,A

·MOV Rr,#data

•

:i MOV@R,#data

•XCHA,R,

"

XCHA,@R

XCHOA,@R

MOVPA,@A

t MOVA,TMOVT,A 0

~STRTT

~STRT CNT

~STOP TCNT

NOP

Jump unconditional		2	04,24.44,64,
Jump indirect		2	B3
Decrement register and		2	ES-EF
jump oo'Rnof zero
Jump on carry= 1			F6
Jump o"n carry=O	2		E6
Jump on A zero	2	2	C6
Jump on Anot zero	2	2	96
Jump on Tl=1		2	56
Jump on Tl=O	2	2	46
Jump on timer flag		2	16
Jump to subroutine			14,34,54,74
Return		2	S3
Clear carry			97
Complement carry			A7
Move register to A			FS·FF
Move data memory to A	1	1	FO·Fl
Move iJ1lrnediate to A	2	2	23
Move A to register			AS·AF
Move A to 'dahlmemory	1		AO-Al
Movf! im"!'edtate~o	2		BS·BF
register
Move immediate to	2	2	BO·Bl
data memory
Exchange A and			2S·2F
register
Exchange A and data			20·21
memory
Exchange nibble of A			30-31
and register
Move to A from current		2	A3
page
Read timer I counter			42
Load timer Jcounter			62
Start timer			55
Start counter			45
Stop timer I counter			65
No operation			00

6'50 AFN-D1S87A-Il3