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name the special functions registers available in 8051accumulatorb registerprogram status wordstack pointerdata pointerport 0port 1port 2port
explain the 16-bit registers dptr and sp of 8051dptrdptr stands for data pointer dptr having of a high byte dph and a low byte dpl its function is to
explain the function of the pins psen and ea of 8051psen psen stands for program store enable in 8051 based system in which an external rom holds the
give the alternate functions for the port pins of port3rd - read data control outputwr - write data control outputt1 - timer counter1 external input
state the function of rs1 and rs0 bits in the flag register of intel 8051 microcontrollerrs1 rs0 - register bank select bitsrs1 rs0
explain djnz instructions of intel 8051 microcontrollera djnz rn reldecrement the content of the register rn and jump if not zerob djnz direct
what is meant by microcontrollera device which having the microprocessor with integrated peripherals like memory serial ports parallel ports
what is rxdrxd- receive data inputthis input pin of 8251a gets a composite stream of the data to be received by
what is txdtxd- transmitter data outputthis output pin carries serial stream of the transmitted data bits by with other information like start bit
what is the use of stepper motora stepper motor is a device used to get an accurate position control of rotating shafts a stepper motor employs
define hrqthe hold demand output requests the access of the system bus in non- cascaded 8257 systems this is linked with hold pin of cpu in cascade
what is key bouncing mechanical switches are used as keys in lots of the keyboards when a key is pressed the contact bounce back and forth and settle
what is the use of 8251 chip8251 chip is mostly used as the asynchronous serial interface among the processor and the external
what is an usartusart stands for universal synchronousasynchronous receiver transmitter it is a programmable communication interface that can
what is io mappingthe assignment of addresses to various io devices in the memory chip is known as io
what is memory mappingthe assignment of memory addresses to several registers in a memory chip is known as memory
what is interfacingan interface is a shared boundary among the devices which includes sharing information interfacing is the process of making two
what is the size of ports in 8255port-a 8-bitsport-cu 4-bitsport-b 8-bitsport-cl
what is the purpose of control word written to control register in 8255the control words written to control register state an io function for every
what is a control wordit is a word kept in a register control register used to control the operation of a program digital
list the operation modes of 8255a io modei mode 0-simple inputoutputii mode 1-strobed inputoutput handshake modeiii mode 2-strobed bidirectional
what is the function of mode set register in 8257the mode set register is used for programming the 8257 as per the needs of the system the function
what is the use of terminal count registereach of the four dma channels of 8257 has single terminal count register this 16-bit register is used for
what is the function of dma address registerevery dma channel has one dma address register the function of this register is to keep the address of
give the register organization of 8257the 8257 do the dma operation over four independent dma channels each of the four channels of 8257 has a couple