At89c52 Research Paper

3.2 AT89c52:

FIG 6: AT89C52 MICROCONTROLLER

 The AT89c52 is a low power, high-performance CMOS 8-bit microcontroller with 8K 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 pin out.

 The on-chip flash allows the program memory to be reprogrammed in system or by a convention nonvolatile memory programmer. by combining a versatile 8-bit CPU within system programmable flash on a monolithic chip, the Atmel AT89c52 is a powerful microcontroller which provides a highly flexible and cost effective solution to many embedded control application.
 The AT89c52 provides the following standard

The main difference between them is that a dial-up modem sends and receives data through a fixed telephone line while a wireless modem sends and receives data through radio waves. Like a GSM mobile phone, a GSM modem requires a SIM card from a wireless carrier in order to operate. A GSM modem can be an external unit or a PCMCIA card (also called PC Card). An external GSM modem is connected to a PC through a serial cable, a USB cable, Bluetooth or Infrared. Like a GSM mobile phone, a GSM modem requires a SIM card from a wireless carrier in order to operate.

 The GSM story began in the early 1980’s, when European countries struggled with no fewer than nine competing analog standards, including Nordic Mobile Telephony (NMT), Total Access Communications Systems (TACS), and so on. In order to put the rise of GSM in context, it is important to note that the climate of economic liberalization and opening up of new markets in Asia, Latin American and Eastern Europe helped boost analog system subscriber numbers throughout the 1990’s. The roll-out of a multinational global communications standard faced several formidable

It is easy to interface with a micro-controller because of an embedded controller. This controller is standard across many displays (HD 44780) which means many micro-controllers have libraries that make displaying messages as easy as a single line of code.
 LCD (Liquid Crystal Display) screen is an electronic display module and find a wide range of applications. A 16x2 LCD display is very basic module and is very commonly used in various devices and circuits. These modules are preferred over seven segments and other multi segment LEDs.
 A 16x2 LCD means it can display 16 characters per line and there are 2 such lines. In this LCD each character is displayed in 5x7 pixel matrix. This LCD has two registers, namely, Command and Data.

Figure 8: LCD