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1、精选优质文档-倾情为你奉上外文资料翻译1、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 eight u
2、ninterrupted 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 micro-
3、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, hav
4、e 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 numerica
5、l 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 RAM, t
6、imer/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 drain I/
7、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, als
8、o 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 write 1
9、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
11、(with) 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 p
12、ush as input 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,
13、 P2 mouth on 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
14、of the eight 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 specia
15、l functions (also 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)P
16、3.5 T1 (1) time/counter,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 reset the chip.ALE/PROG - when access to external program memory or numerical memory, ALE (
