8051-
An 8051 Electronic Combination Lock Can
Use Cell Phone To Give Alarm
i
80518051LCD
ii
Abstract
The 8051 electronic combination lock use the basic assembler of 8051.To Combine
LCD, keyboard, a bunch of communication of arranging. Use 8051 basic ideas
realizing being controlled, and has used the cell-phone to send the alert news, It
will be a independence than the channel free from interruption by
external world, Not easier to be destroyed by the outside.
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............................................................ii
...............................................................iii
..............................................................iv
...............................................................v
.........................................................1
............................................2
2.1 ..............................................2
2.2 8051..........................................4
2.3 8051IC..........................................5
2.4 8051..............................................9
LCD................................................11
3.1 LCD....................................................11
3.2 LCD .......................................13
3.3 LCD............................................15
...................................................19
4.1 RS-232.............................................19
4.2 RS-232.......................................21
4.3 VB ......................................23
...........................................25
5.1 ...........................................25
5.2 AT ..............................................26
...........................................................27
I........................................................28
II.......................................................29
III ASCII code.................................................30
IV.............................................31
V....................................................32
iv
2.1 ............................................2
2.2 8051 ..........................................4
2.3 8051 ............................................5
2.4 8051...........................................9
3.1 LCD ................................................11
3.2 DDRAM (16X2).....................11
3.3 DDRAM (16X4).....................12
3.4 LCD ............................................12
3.5 LCD ............................................14
3.6 LCD ............................................14
4.1 RS-232 .........................................21
5.1 .................................................25
I-1 .....................................................27
II.1 ....................................................28
IV-1 ...............................................30
IV-2 ...............................................30
v
2.1 8051 ..............................................5
4.1 RS-232 ().................................19
4.2 RS-232 ().................................19
4.3 9PIN 25PIN ...................................20
5.1 AT .....................................................26
III-1 ASCII code..................................................29
1
8051
(LCD
)
2
2.1
2.1
CPU(Center Processing Unit)
1. (Arithmetic Logic Unit ALU)
(
)(ANDORNOT )
2. (Control Unit CU)
(Decode)(Execute)
3. (Input Unit IU)
3
CPU
4. (Output Unit OU)
CPU
5. (Memory Unit MU)
(Main Memory)
(Auxiliary Memory)
(Read Only Memory ROM)(Random Access Memory
RAM)ROM
RAM
RAM
4
2.2 8051
2.2 8051
8051
1. 8
2.
3. 128 RAM 4K ROM
4. 4 8 I/O
5. 2 16 /
6. UART
7. 5
8.
5
2.3 8051IC
2.3 8051
2.1 8051
1~8 P1.0~P1.7
1(P1)8 I/O
,P1.0 LSB,8 (P1.7)MSB,P1
4 LS-TTL .
9 RESET
8051 (RESET),8051
Low .High(+5V)
,8051 ,8051
6
0000H .RAM00H~7FH
,(SFR)
.
10~17 P3.0~P3.7 P3 8 I/O
,I/O /
,2 .
P3.0 RXD
P3.1 TXD
P3.2 INT0 0
P3.3 INT1 0
P3.4 T0 / 0
P3.5 T1 / 1
P3.6 WR RAM,
P3.7 RD RAM,
18~19 XTAL2(18)
XTAL1(19)
8051 ,
12MHZ ,9051
12MHZ ,.
20 Vss 8051 ,8051
.
21~28 P2.0~P2.7 P3 8 I/O
,P2 I/O , 8051
7
EPROM, RAM
,P2 8051
(Highbyte,A8~A15) P0 (Lowbyte)
16 ,
29 (Program Store
Enable),8051
, .
OE .
8051 PSEN RD
,.,
64K Bytes2k7EPROM 64K Byte RAM.
30 ALE (Address Latch Enable),8051
, P0
(A0~A7), P0 /
, 74LS373
31 /(External Access enable),
EA1 ,CPU ,EA=0 ,
.,8751 8051
,EA VCC(+5.0V).
32~39 P0.0~P0.7 P0 (Open Drain)I/O .
1 P0 ,P0 (float),
,P1,P2,P3
8
Pull-up,,
,P0 I/O ,
(Pull-up)4.7K.
H,.P0
,,P0
(A0~A7)(D0~D7)
,P0 8
.A0~A7 P2 A8~A15
16 address bus.8051
64K
40 Vcc
9
2.4 8051
(EPROMFlash ROM),CPU
,.MCS-51 16 ,
216=64K,MCS-51 1 Byte,MCS-51
64Kbyte.8051 4K ,
60KByte.MCS-51 EA ,
MCS-51 ,,,
2.4 8051
MCS-51 ,.MOV(),
MOVX().CPU MOVX ,RD WR
.MOV .MSC-51 256Kbyte
,128(00H~7FH),128KByte (SFR).
10
RAM,PC RAM ,,PC
RAM .RAM .
RAM DataMemory.128Kbyte .00H~1FH,
,8Byte,32Byte.20H~2FH,16 Byte,
.16
,16X8=128 .30H~7FH user
(General purpose RAM).
11
LCD
3.1 LCD
,,
.LCD,,,
2 .LCD
16X1,16X2,20X1,20X2,40X1,40X2 .
3.1 LCD
LCD ,,,LCD
/HD44780 (),
,80
,LCD 80 .
LCD Show
DDRAM
3.2 DDRAM (16X2)
12
3.3 DDRAM (16X4)
CPU LCD ,ASCII
LCDDDRAM,LCD.,LCD
(00h),A.ASCII-41H,DDRAM 00H .
:
3.4 LCD
13
3.2 LCD
1. Busy Flag(BF)
BF LCDCPU,BF=1,LCD
,LCD.BF=0,CPU
LCD.RS=0 R/W=1 ,DB7 .
2.
LCD 2 8 ,(InstructionRegister
IR),(Data Register,DR),8 ,RS
.
3. AC
DD RAM CG RAM .
IR ,LCD IR AC.
,AC (I/D=1)(I/D=0).
4. Character Generat ROM (CG ROM)
LCD ROM,192 5x7 .
,DD RAM ASCII .:A
01000001(41H)
5.
LCDCG ROM,64
CG RAM user ,8(5x7
),64/8=8,8 .,5X
CG RAM .,00H~07H.
14
3.5 LCD
3.6 LCD
15
3.3 LCD
LCD CPU IR ,.11 ,
Clear Display Cursor Home 1.64ms ,40ns.
1. Clear Display
: DDR20H,,DD
RAM AC 00H,I/D 1.
2. Curse Home
: DD RAM ,,
,DD RAM 00H.
3. Entry Mode
:,.
S I/D
0 0 ,,AC
0 1 ,,AC
1 1 ,,AC
1 1 ,,AC
16
4. ON/OFF (Display ON/OFF)
: D:,D=0 D=1,
C:, C=0 C=1
B:Blink ,B=0 ,B=1
5.
: ,
.
S/C R/L
0 0 ,AC
0 1 ,AC
1 1 ()
1 1 ()
6. Function Set
: DL:,DL=1 8 ,DL=0 4 .
N:,N=0 ,1 N=1 ,2 .
F:Font .
17
7. CG RAM
: CG RAM ,A5~A0 00H~3FH 64
,,CGRAM.
8. 8.DD RAM
: DD RAM ,A6~A0 ,
DD RAM .
9. BF AC .
: BF=1,LCD,,
CPU ,BF=0 .BF ,
(DB0~DB6),,CG RAM
DD RAM ,.
10. CG RAM DD RAM
18
: 8 (D0~D7)DD RAM CG RAM,,
DD RAM CG RAM .
11. CG RAM DD RAM
: 8 (D0~D7)DD RAM CG RAM,,
DD RAM CG RAM
19
4.1 RS-232
4.1 RS-232 ()
4.2 RS-232 ()
0/1
IC MAX-232ICL-232
PC (Handshake)25PINPC
20
ICE
3 (9PIN)
4.3 9PIN25PIN
9PIN
21
4.2 RS-232
4.1 RS-232
1 -5V -15V TXDRXD
-5V -15V 3.1
Start Bit1 7 8
D0-D7/D8 Parity Bit (Stop Bit)
Parity Bit Odd ParityEven
ParityNo Parity
No Parity7-bit
8-bit
8-bit (Stop Bit)11.52
2
1
VB MSComm1.Settings = " 9600,N,8,1"
9600 bit/S 8-bit data No Parity 1 stopbit9600
Baud-Rate " 9600,N,8,1" 1
10 ( start-bit + 8 bits+stop-bit=10 bits)1/9600 *10
=1.042 mS1KB 1.042
(Alogrithem)
22
1. 0
2. 0.5 0
3. 1 0
4. 7
