附件1：外文資料翻譯譯文單片機(jī)at89c(參考版)
2024-11-09 16:49本頁(yè)面
【正文】 6 . 薄而脆的工件很容易加工，且無(wú)毛刺。 4 . 由于刀具（電極）從未與工件接觸過(guò)，故工件中不會(huì)產(chǎn)生應(yīng)力。 2 . 工件可在淬火狀態(tài)下加工，因克服了由淬火引起的變形問(wèn)題。 1 . 不論硬度高低，只要是導(dǎo)電材料都能對(duì)其進(jìn)行切削。緩慢切除金屬（精切削）和需獲得高的表面光潔度時(shí)，用小電流,高頻率,低電容和最高的間隙電壓。 需要的表面粗糙度的類型，決定了能使用的安培數(shù),電容,頻率和電壓值。用低的金屬切除率時(shí)，表面粗糙度可達(dá)2—4vin.(—)。不斷循環(huán)著的不導(dǎo)電的液體，將侵蝕下來(lái)的金屬粒子帶走，同時(shí)也有助于驅(qū)散火花產(chǎn)生的熱量。頻率為20000Hz左右的低電壓大電流的直流電加到電極上，這些電脈沖引起火花，跳過(guò)電極與工件的見的不導(dǎo)電的液體間隙。它應(yīng)當(dāng)是點(diǎn)的不良導(dǎo)體或絕緣體。電極形狀與所需型腔想匹配。 電火花加工法是一種受控制的金屬切削技術(shù)，它使用電火花切除（侵蝕）工件上的多余金屬，工件在切削后的形狀與刀具（電極）相反。在金屬切削工業(yè)中，這種加工方法正不斷尋找新的應(yīng)用領(lǐng)域。 Products? 8K Bytes of InSystem Programmable (ISP) Flash Memory? 1000 Write/Erase Cycles? Fully Static Operation: 0 Hz to 33 MHz? Threelevel Program Memory Lock? 256 x 8bit Internal RAM? 32 Programmable I/O Lines? Three 16bit Timer/Counters? Eight Interrupt Sources? Full Duplex UART Serial Channel? Lowpower Idle and Powerdown Modes? Interrupt Recovery from Powerdown Mode? Watchdog Timer ? Dual Data Pointer? Poweroff FlagDescriptionThe AT89S52 is a lowpower, highperformance CMOS 8bit microcontroller with 8K bytes of insystem programmable Flash memory. The device is manufactured using Atmel’s highdensity nonvolatile memory technology and is patible with the industry standard 80C51 instruction set and pinout. The onchip Flash allows the programmemory to be reprogrammed insystem or by a conventional nonvolatile memory bining a versatile 8bit CPU with in system programmable Flash on a monolithicchip, the Atmel AT89S52 is a powerful icrocontroller which provides a highlyflexible and costeffective solution to many embedded control AT89S52 provides the following tandard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16bit timer/counters, a sixvector twolevel interrupt architecture, a full duplex serial port, onchip oscillator,and clock circuitry. In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Powerdown mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next interrupt or hardware reset.Pin ConfigurationsBlock DiagramPin DescriptionVCCSupply voltage.GNDGround.Port 0Port 0 is an 8bit open drain bidirectional I/O port. As an output port, each pin can sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as high impedance Inputs.Port 0 can also be configured to be the multiplexed loworder address/data bus during ccesses to external program and data memory. In this mode, P0 has int ernal pullups.Port 0 also receives the code bytes during Flash programming and outputs the code bytes dur ing program pullups are required during program veri fication.Port 1Port 1 is an 8bit bidirectional I/O port with internal Port 1 output buffers can sink/source four TTL 1s are written to Port 1 pins, they are pulled high bythe internal pullups and can be used as inputs. As inputs,Port 1 pins that are externally being pulled low will sourcecurrent (IIL) because of the internal pullups.In addition, and can be configured to be the ti mer/counter 2 exte rnal count input () and the timer/counter 2 trigger input(), respectively, as shown in the following table.Port 1 also receives the loworder address bytes during Flash programming and verification.
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