Format of control register-microprocessor, Assembly Language

Format of Control Register

The format for the control register is given in Figure. Bit 0 of this register might be one before data may be output  and  bit  two  might be  one  before  data  can  be  received.  Programmed   answering of a modem is accomplished by setting bit 1 to 1 since this forces the DTR pin to zero and the complement of DTR is usually linked to the CD line from the modem. Bit 3 equal to 1 force TxD to 0, thus causing break characters to be transmitted. Setting bit 4 to 1 causes every error bits in the status register to be cleared (the bits that are set when overrun, framing and parity errors occur). Bit 5 is utilized for sending a Request to send signal to a modem. If the complement of the RTS pin is linked to a modem's CA line, then a one put in bit5 will cause the CA line to go high.  Setting bit 6 causes the8251 A to be reinitialized and the reset sequence to be re-entered (for instance a return is made to the top of the flowchart shown in Figure and the next output will be to the mode register). Bit seven is utilized just with the synchronous mode. When set, it causes the 8251A to start a bit-by-bit search for a sync character or sync characters.

358_format control register.jpg

Posted Date: 10/10/2012 7:58:05 AM | Location : United States







Related Discussions:- Format of control register-microprocessor, Assignment Help, Ask Question on Format of control register-microprocessor, Get Answer, Expert's Help, Format of control register-microprocessor Discussions

Write discussion on Format of control register-microprocessor
Your posts are moderated
Related Questions
You have been hired by the Elbonian government to write an Assembly program to help its workforce determine how much their tax will be. The tax laws in Elbonian are very simple. Th

bello need help with a final project , I have to do a presentation on a digital stop watch , but I have to use edsim51 to make it wondering if you guys can help me

Program is written but has errors returning values from the procedure.

Internal Architecture of Microprocessor : The architecture of 8086 provides a number of improvements over 8085 architecture. It supports a, a set of 16-bit registers ,16-bit AL

RICS/CISC Architecture An essential aspect of computer architecture is the design of the instruction set for the processor.  The instruction set selected for a specific compute

write a Mips program that read a string AND PRINT IT ON THE SCREEN

Project Overview In this series of projects you will write a compiler for a small subset of Pascal.  In this assignment, you will start writing the syntax analysis and code gen

AAS: ASCII Adjust AL After Subtraction AAS instruction correct the result in the AL register after subtracting operation of two unpacked ASCII operands. The result is in unpacked

which uses BIOS interrupt INT 21 to read current system time and displays it on the top-left corner of screen.

AAM: ASCII Adjust for Multiplication after execution. This instruction converts the product available in the AL into unpacked BCD format.  This follows a multiplication   instruct