1 General Description
The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of In-System Programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with In-System Programmable Flash on a monolithic chip, the Atmel AT89S51 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.
The AT89S51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, two 16-bit timer/counters, a five-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S51 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes.
該AT89S51是一個(gè)低功耗，高性能CMOS 8位微控制器,可在4K字節(jié)的系統(tǒng)內(nèi)編程的閃存存儲(chǔ)器。該設(shè)備是采用Atmel的高密度、非易失性存儲(chǔ)器技術(shù)和符合工業(yè)標(biāo)準(zhǔn)的80C51指令集和引腳。芯片上的Flash程序存儲(chǔ)器在系統(tǒng)中可重新編程或常規(guī)非易失性內(nèi)存編程 。通過(guò)結(jié)合通用8位中央處理器的系統(tǒng)內(nèi)可編程閃存的單芯片， AT89S51是一個(gè)功能強(qiáng)大的微控制器提供了高度靈活的和具有成本效益的解決辦法，可在許多嵌入式控制中應(yīng)用。
在AT89S51提供以下標(biāo)準(zhǔn)功能： 4K字節(jié)的Flash閃存 ， 128字節(jié)的RAM ， 32個(gè) I / O線，看門狗定時(shí)器，兩個(gè)數(shù)據(jù)指針，兩個(gè)16位定時(shí)器/計(jì)數(shù)器， 5向量?jī)杉?jí)中斷結(jié)構(gòu)，全雙工串行端口，片上振蕩器和時(shí)鐘電路。此外， AT89S51設(shè)計(jì)了可降至零頻率的靜態(tài)邏輯操作和支持兩種軟件可選的節(jié)電工作模式。