防盗报警系统英文资料

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Structure and function of the MCS-51 series one-chip computer is a name of a

piece of one-chip computer series which Intel Company produces. This company

introduced 8 top-grade one-chip computers of MCS-51 series in 1980 after

introducing 8 one-chip computers of MCS-48 series in 1976. It belong to a lot of

kinds this line of one-chip computer the chips have, such as 8051, 8031, 8751,

80C51BH, 80C31BH,etc., their basic composition, basic performance and instruction

system are all the same. 8051 daily representatives 51 serial one-chip computers.

An one-chip computer system is made up of several following parts: (1) One

microprocessor of 8 (CPU). (2) At slice data memory RAM (128B/256B),it use not

depositing not can reading /data that write, such as result not middle of operation,

final result and data wanted to show, etc. (3) Procedure memory ROM/EPROM

(4KB/8KB ), is used to preserve the procedure , some initial data and form in slice.

But does not take ROM/EPROM within some one-chip computers, such as 8031,

8032, 80C51, etc.. (4) Four 8 run side by side I/O interface P0 four P3, each mouth

can use as introduction, may use as exporting too. (5) Two timer / counter, each timer

/ counter may set up and count in the way, used to count to the external incident, can

set up into a timing way too, and can according to count or result of timing realize the

control of the computer. (6) Five cut off cutting off the control system of the source.

(7) One all duplexing serial I/O mouth of UART (universal asynchronous

receiver/transmitter (UART) ), is it realize one-chip computer or one-chip computer

and serial communication of computer to use for. (8) Stretch oscillator and clock

produce circuit, quartz crystal finely tune electric capacity need outer. Allow

oscillation frequency as 12 megahertas now at most. Every the above-mentioned part

was joined through the inside data bus .Among them, CPU is a core of the one-chip

computer, it is the control of the computer and command centre, made up of such

parts as arithmetic unit and controller , etc.. The arithmetic unit can carry on 8 persons

of arithmetic operation and unit ALU of logic operation while including one, the 1

storing device temporarilies of 8, storing device 2 temporarily, 8's accumulation

device ACC, register B and procedure state register PSW, etc. Person who accumulate

ACC count by 2 input ends entered of checking etc. temporarily as one operation

often, come from person who store 1 operation is it is it make operation to go on to

count temporarily , operation result and loopback ACC with another one. In addition,

ACC is often regarded as the transfer station of data transmission on 8051 inside. The

same as general microprocessor, it is the busiest register. Help remembering that 2

agreeing with a expresses in the order. The controller includes the procedure counter,

the order is deposited, the order decipher, the oscillator and timing circuit, etc. The

procedure counter is made up of counter of 8 for two, amounts to 16. It is a byte

address counter of the procedure in fact, the content is the next IA that will carried out

in PC. The content which changes it can change the direction that the procedure

carries out. Shake the circuit in 8051 one-chip computers, only need outer quartz

crystal and frequency to finely tune the electric capacity, its frequency range is its

12MHZ of 1.2MHZ. This pulse signal, as 8051 basic beats of working, namely the

minimum unit of time. 8051 is the same as other computers, the work in harmony

under the control of the basic beat, just like an orchestra according to the beat play

that is commanded.

There are ROM (procedure memory , can only read ) and RAM in 8051 slices

(data memory, can is it can write ) two to read, they have each independent memory

address space, dispose way to be the same with general memory of computer.

Procedure 8051 memory and 8751 slice procedure memory capacity 4KB, address

begin from 0000H, used for preserving the procedure and form constant. Data 8051-

8751 8031 of memory data memory 128B, address false 00FH, use for middle result

to deposit operation, the data are stored temporarily and the data are buffered etc.. In

RAM of this 128B, there is unit of 32 bytes that can be appointed as the job register,

this and general microprocessor is different, 8051 slice RAM and job register rank

one formation the same to arrange the location. It is not very the same that the

memory of MCS-51 series one-chip computer and general computer disposes the way

in addition. General computer for first address space, ROM and RAM can arrange in