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Salaam
It seems that it has a serial port like SPI wich could be programmed. (Like its mode) Or a USART with programmable specs lik baud rate, start bit, stop bit, parity ...
It provides both synchronous and asynchronous communication modes. It operates as a
Universal Asynchronous Receiver and Transmitter (UART) in three full-duplex modes
(Modes 1, 2 and 3). Asynchronous transmission and reception can occur simultaneously
and at different baud rates.
It is also receive-buffered, meaning it can commence reception of a second byte before
a previously received byte has been read from the receive register. (However, if the first
byte still hasn’t been read by the time reception of the second byte is complete, one of
the bytes will be lost). The serial port receive and transmit registers are both accessed
at Special Function Register SBUF. Writing to SBUF loads the transmit register, and
reading SBUF accesses a physically second receive register.
Alirez.m.f is correct in that the datasheet refers to the serial interface of the AT89S52 as a programmable serial channel and then refers you to the "Atmel 8051 Microcontrollers Hardware Manual" where it details the programmable features of the serial interface, both synchronous and asynchronous modes.
Salaam
It seems that it has a serial port like SPI wich could be programmed. (Like its mode) Or a USART with programmable specs lik baud rate, start bit, stop bit, parity ...
thankzz for responding very fast and have one more doubt regarding ULN driver which has its voltage specifications of output voltage 50v but a normal stepper motor can tolerate upto 12v but v use ULN driving stepper motor..how is this possible?
It is a absolute maximum i think. It defines the maximum voltage value which device can stand... If you want to use higher than 50V it will be damaged. As far as you use 12V on common input and motor supply, it is OK.
how is reception done in an 8051 uc???...do we have to keep on resetting a continuosly transmting transmitter for the sequence to get received on the receiver????
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