Another advatage of this microcontroller is that it has a built-in UART for serial communication. P0 needs external pull-ups, the others all are internal pull-ups. Port P0 provides low-byte addresses when connected to external memory. All these ports are 8-bit bi-directional ports, i.e., they can be used asīoth input and output ports. They can be used as both input and output pins. In these 40 pins P1, P2 and P3 are 8-bit bi-directional ports. There are four ports which areĭesigned as P0, P1, P2 andP3. Microcontroller 89c51 consists of 40 pins. Mode disables the oscillator but idle mode has the advantage of saving RAM contents. The idle mode stops the CPU working but allows RAM, serial ports and timers to work and the power-down Here we will discuss about two of its modes. The microcontroller has a full duplex serial port and on-chip circuitry. The 89c51 is designed with static logic for operation down to zeroįrequency. ![]() It is a low-power microcontroller with 32 I/O lines and two 16-bit timers or counters. It can be erased and programmed to a maximum of 1000 times. It has 4kb of flash programmable and erasable read only memoryĪnd 128 bytes of RAM.
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