基于串口通信的字符顯示終端的設(shè)計(jì)外文翻譯-其他專業(yè)(編輯修改稿)
2025-02-24 08:47 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 simple, low power consumption, in the absence of a dedicated chip when regarded as a workaround. The introduction of the RS. 232 to TTL level conversion method can be applied to most of the munication system, in some special applications such as electrostatic protection needs, multitransceiver (eg with MODEM connected) can be used when MAX238 (4 drive, four receiving) or MAX3221t t15Kv electrostatic protection) and other chips. 2, singlechip serial munication design SCM string works the widely used 51 series microcontroller serial munication can operate in synchronous or asynchronous mode, most patible with the 8051 series has one or more UART asynchronous serial interface, which is designed for users munication program provides good facilities. When the application system requires multiple serial munication interface, we can use the following methods: (a) multichip serial port, such as Winbond WW77E58 there are two serial interfaces。 (2) adopt a mon asynchronous serial port expansion chips, such as TLl6c552 (2 way), LCl6C554 (4 channel)。 (3) using general I / O analog munication. This is the most simple and economical method, and can achieve highspeed serial munication method See Electronic World) magazine published the article previously. This article discusses only asynchronous serial munication using a design method, singlechip serial control mode MCS51 series singlechip serial port is controlled by the serial port control register SCON and PCON Power control register settings to achieve. SCON is a bitaddressable special function registers, by setting SGON the SM0 and SMI, will enable SCM There are four different ways of working. SCON format can be found in the relevant manual. And PC used for serial munication, generally set to Mode 1 or Mode 3, the main difference is the way to a data format is 8 bits, Mode 3 data format is 9, wherein the first nine SM2 for multiple machines munication bits, 39。can achieve singlechip multipoint munications. The Power Control register PCON SMOD as serial port baud rate serial control bit microcontroller product when vibration is an integer (eg 6M), is a monly available set 5MOD higher munication speed train, but not SMOD bit addressing This point must ask the reader39。s attention. Microcontroller serial port rate setting microcontroller and PC munication, the munication rate by timer T1 or T2 timer generates (52 series), at work in the way 2:00
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