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1、单片机外文翻译-STC89C52处理芯片 外文原文STC89C52 processing chipPrime features:With MCS - 51 SCM product compatibility, 8K bytes in the system programmable Flash memory, 1000 times CaXie cycle, the static operation: 0Hz 33Hz, triple encryption program memory, 32 programmed I/O port, three 16 timer/counter, the eig
2、ht uninterrupted dual-career UART serial passage, low power consumption, leisure and fall after fall electric power mode can be awakened and continuous watchdog timer and double-number pointer, power identifier.Efficacy: characteristicsSTC89C52 is one kind of low power consumption, high CMOS8 bit mi
3、cro-controller, 8K in system programmable Flash memory. Use high-density nonvolatile storage technology, and industrial 80C51 product instruction and pin fully compatible. The Flash memory chips allows programs in the system, also suitable for programmable conventional programming. In a single chip,
4、 have clever 8 bits CPU and online system programmable Flash, increase STC89C52 for many embedded control system to provide high vigorous application and useful solutions. STC89C52 has following standard efficacy: 8k byte Flash RAM, 256 bytes, 32 I/O port, the watchdog timer, two, three pointer nume
5、rical 16 timer/counter, a 6 vector level 2 continuous structure, the serial port, working within crystals and horological circuit. In addition, 0Hz AT89S52 can drop to the static logic operation, support two software can choose power saving mode. Idle mode, the CPU to stop working, and allows the RA
6、M, timer/counters, serial, continuous to work. Protection asana pattern, RAM content is survival, vibrators frozen, SCM, until all the work under a continuous or hardware reset. 8-bit microcontrollers 8K bytes in the system programmable Flash AT89S52 devices.Mouth: P0 P0 mouth is a two-way open drai
7、n I/O. As export, each can drive eight TTL logic level. For P0 port to write 1, foot as the high impedance input.When access to external programs and numerical memory, also known as low P0 mouth eight address/numerical reuse. In this mode, with the internal P0 resistor.In the flash when programming,
8、 also used for P0 mouth; absorb instruction bytes In the process, the output command byte calibration. When the program requires external, calibration on pull-up resistors.Mouth: P1 mouth P1 is an internal resistance of the eight two-way I/O buffers can drive, P1 output four TTL logic level. To writ
9、e 1 P1 port, the internal resistance to port, can push as input mouth. When used as input, external and internal foot because of low resistance, will output current IIL .In addition, P1.0 and P1.2 respectively timer/counter 2 external counting input P1.0 / T2 and when the trigger editor/counter P1.1
10、 input 2 , specific T2EX/are shown below. In programming and calibration, flash P1 mouth absorb eight address low byte.Efficacy: the foot.P1.0 T2 timer/counter T2 external counting input , clock outputP1.1 T2EX timer/counter T2 capture/overloaded triggered signals and direction control ,P1.5 MOSI wi
11、th online system programming,P1.6 MISO with online system programming,P1.7 SCK with online system programming,Mouth: P2 P2 mouth is an internal resistance of the eight two-way I/O buffers and P2 output can drive four TTL logic level. To write 1 P2 port, the internal resistance to port, can push as i
12、nput mouth. When used as input, external and internal foot because of low resistance, will output current IIL .In the external program memory access or use 16bit external numerical memory address read for example MOVX execution DPTR , P2 mouth send out high 8 address. In this application, P2 mouth o
13、n the internal use strong pull send 1. In using 8-bit address such as MOVX RI access to external numerical memory, P2 mouth output P2 latches content. In programming and calibration, flash P2 mouth also absorb high eight address byte and some control signal.P3: a P3 mouth on the inside of the eight
14、two-way pull-up resistors I/O buffers can drive, p2 output four TTL logic level. For P3 port to write 1, the internal resistance to port, can push as input mouth. When used as input, external and internal foot because of low resistance, will output current IIL . P3 mouth AT89S52 special functions al
15、so as the second efficacy , are shown below. In programming and calibration, flash also absorb some P3 mouth control signals.Port pin second efficacy:P3.0 RXD serial input P3.1 TXD serial export ,P3.2 INTO the discontinuous 0 P3.3 INT1 1 the discontinuousP3.4 time/counter TO 0 P3.5 T1 1 time/counter
16、,P3.6 WR external numerical memory write for P3.7 RD external numerical memory read for In addition, also absorb some used in mp3 mouth FLASH memory programming and calibration of program control signals.RST, reset input: when the vibrator, RST pin appeared two machine cycle above high level will be
17、 reset the chip.ALE/PROG - when access to external program memory or numerical memory, ALE address latch allow output pulses are used to latch address of low eight bytes. Normally, ALE with clock frequencies are 1/6 output pulse signal with fixed, so it can be used for the purpose or output clocks.
18、Timing Those who want an attention is: whenever access to external numerical memory will skip a ALE pulse.For FLASH memory programming, this pin is used for input programming pulse . PROGIf necessary, but through special effect to the zone registers SFR 8EH D0 position, the unit can be banned ALE op
19、erations. This position is a bit, MOVX and MOVC instructions will be activated. ALE - In addition, the foot will be weak, execute external program MCU hign should be banned, a void. Set ALEPSEN - program storage PSEN allowed output is outside of the program memory read, choose communication by exter
20、nal program memory when taking AT89C52 instructions or , each machine cycle PSEN twice, two pulse output is useful, during this period, when access to external numerical memory, will skip PSEN twice.EA/VPP - external access permission, to make the CPU only access to external program memory address f
21、or 0000H - FFFFH , EA end must remain low level ground . Should notice is: if a LB1 is encrypted, reset when programming will latch EA end.As for the high level of the EA VCCS , the CPU is the implementation of the program memory internal instructions.FLASH memory when programming, this pin plus + 1
22、2 v programming allow power Vpp, of course, that is the part is used to Vpp voltage 12V programming.中文译文STC89C52处理芯片 首要性能 与MCS-51单片机产物兼容 、8K字节在系统可编程Flash存储器、 1000次擦写周期、全静态操作：0Hz33Hz 、三级加密程序存储器、 32个可编程I/O口线 、三个16位定时器/计数器 八个间断源、全双职工UART串行通道、 低功耗空闲和掉电模式 、掉电后间断可唤醒 、看门狗定时器 、双数值指针 、掉电标识符。 功效特性描述 STC89C52
23、是一种低功耗、高性能CMOS8位微控制器，具有 8K 在系统可编程Flash 存储器。使用高密度非易失性存储器技术制造，与工业80C51 产物指令和引脚完全兼容。片上Flash允许程序存储器在系统可编程，亦适于常规编程器。在单芯片上，拥有灵巧的8 位CPU 和在线系统可编程Flash，使患上STC89C52为众多嵌入式控制应用系统提供高矫捷、超有用的解决方案。 STC89C52具有以下标准功效： 8k字节Flash，256字节RAM， 32 位I/O 口线，看门狗定时器，2 个数值指针，三个16 位 定时器/计数器，一个6向量2级间断结构，全双职工串行口， 片内晶振及钟表电路。另外，AT89S
24、52 可降至0Hz静态逻辑操作，支持2种软件可选择节电模式。空闲模式下，CPU 停止工作，允许RAM、定时器/计数器、串口、间断继续工作。掉电保护体式格局下，RAM内容被生存，振动器被冻结，单片机一切工作停止，直到下一个间断或者硬件复位为止。8 位微控制器 8K字节在系统可编程 Flash AT89S52 P0 口：P0口是一个8位漏极开路的双向I/O口。作为输出口，每位能驱动8个TTL逻辑电平。对于P0端口写“1”时，引脚用作高阻抗输入。 当访问外部程序和数值存储器时，P0口也被作为低8位地址/数值复用。在这种模式下， P0具有内部上拉电阻。 在flash编程时，P0口也用来吸收指令字节；在
25、程序校验时，输出指令字节。程序校验时，需要外部上拉电阻。 P1 口：P1 口是一个具有内部上拉电阻的8 位双向I/O 口，p1 输出缓冲器能驱动四个 TTL 逻辑电平。对于P1 端口写“1”时，内部上拉电阻把端口拉高，此时可以作为输入口使用。作为输入使用时，被外部拉低的引脚由于内部电阻的原因，将输出电流（IIL）。 此外，定时器/计数器2的外部计数输入（P1.0/T2）和时器/计数器2 的触发输入（P1.1/T2EX），具体如下表所示。 在flash编程和校验时，P1口吸收低8位地址字节。 引脚号第二功效 P1.0 T2（定时器/计数器T2的外部计数输入），钟表输出 P1.1 T2EX（定时器
26、/计数器T2的捕捉/重载触发信号和方向控制） P1.5 MOSI（在线系统编程用） P1.6 MISO（在线系统编程用） P1.7 SCK（在线系统编程用） P2 口：P2 口是一个具有内部上拉电阻的8 位双向I/O 口，P2 输出缓冲器能驱动四个 TTL 逻辑电平。对于P2 端口写“1”时，内部上拉电阻把端口拉高，此时可以作为输入口使用。作为输入使用时，被外部拉低的引脚由于内部电阻的原因，将输出电流（IIL）。 在访问外部程序存储器或者用16位地址读取外部数值存储器（例如执行MOVX DPTR） 时，P2 口送出高八位地址。在这种应用中，P2 口使用很强的内部上拉发送1。在使用 8位地址（如
27、MOVX RI）访问外部数值存储器时，P2口输出P2锁存器的内容。在flash编程和校验时，P2口也吸收高8位地址字节和一些控制信号。 P3 口：P3 口是一个具有内部上拉电阻的8 位双向I/O 口，p2 输出缓冲器能驱动四个 TTL 逻辑电平。对于P3 端口写“1”时，内部上拉电阻把端口拉高，此时可以作为输入口使用。作为输入使用时，被外部拉低的引脚由于内部电阻的原因，将输出电流（IIL）。 P3口亦作为AT89S52特殊功效（第二功效）使用，如下表所示。在flash编程和校验时，P3口也吸收一些控制信号。 端口引脚第二功效 P3.0 RXD 串行输入口 P3.1 TXD 串行输出口 P3.2
28、 INTO 外间断0 P3.3 INT1 外间断1 P3.4 TO 定时/计数器0 P3.5 T1 定时/计数器1 P3.6 WR 外部数值存储器写选通 P3.7 RD 外部数值存储器读选通 此外，P3口还吸收一些用于FLASH闪存编程和程序校验的控制信号。 RST复位输入当振动器工作时，RST引脚出现两个机器周期以上高电平将是单片机复位。 ALE/PROG当访问外部程序存储器或者数值存储器时，ALE（地址锁存允许）输出脉冲用于锁存地址的低8位字节。一般情况下，ALE仍以钟表振动频率的1/6输出固定的脉冲信号，因此它可对于外输出钟表或者用于定时目的。要注重的是：每当访问外部数值存储器时将跳过一
29、个ALE脉冲。 对于FLASH存储器编程期间，该引脚还用于输入编程脉冲（PROG）。 如有必要，可通过对于特殊功效寄存器（SFR）区中的8EH单位的D0位置位，可禁止ALE操作。该位置位后，只有一条MOVX和MOVC指令才气将ALE激活。此外，该引脚会被微弱拉高，单片机执行外部程序时，应设置ALE禁止位无效。 PSEN程序储存允许（PSEN）输出是外部程序存储器的读选通信号，当AT89C52由外部程序存储器取指令（或者数值）时，每一个机器周期两次PSEN有用，即输出两个脉冲，在此期间，当访问外部数值存储器，将跳过两次PSEN信号。 EA/VPP外部访问允许，欲使CPU仅访问外部程序存储器（地址为0000H-FFFFH），EA端必须保持低电平（接地）。需注重的是：如果加密位LB1被编程，复位时内部会锁存EA端状态。 如EA端为高电平（接Vcc端），CPU则执行内部程序存储器的指令。 FLASH存储器编程时，该引脚加上+12V的编程允许电源Vpp，当然这必须是该部件是使用12V编程电压Vpp第1章 标题