Parallel ports - micro-controller, Computer Engineering

Assignment Help:

The main I/O used by micro controllers are the parallel ports , the 68HC11F1 has seven  8 bit ports namely Port A,B,C,D,E,F and G . The use of ports depends on the mode configuration of the system and the use of the other peripheral devices, since they share pins. In order to program the ports we need to write/read data to special registers, the area from 0x1000 to 0x105f is memory mapped to the peripheral devices.  NOTE: The monitor has moved the register block to start at 0x00 i.e Padr = 0x00, Paddr = 0x1 etc.

Below are shown the RAM based I/O registers i.e. 0x0 to 0x0a
 
  Address   Register
 
  0x0000  Port A register Padr
   0x0001  Port A Data direction register Paddr
  0x0002  Port G register Pgdr
  0x0003  Port G Data direction register Pgddr
  0x0004  Port B register Pbdr
  0x0005  Port F register Pfdr
  0x0006  Port C register Pcdr
  0x0007  Port C Data direction register Pcddr
  0x0008  Port D register Pddr
  0x0009  Port D Data direction register Pdddr
  0x000a  Port E register Pedr
 
Port A, D, are bi-directional 8 bit ports and have alternate uses G timer, serial comms and chip selects respectively.
 
Port B is an 8 bit general purpose output port with alternate function as the upper address bus in the extended mode.
 
Port C is a general purpose 8 bit port with alternate functions as the data bus in the extended mode
 
Port E is an 8 bit general purpose 8 bit input port with an alternate function as the ADC input
 
Port F is a 8 bit general purpose output port with alternate function as the lower address bus in the extended mode.
 
On the target system provided the 68HC11 is set in extended mode therefore the only ports available are A,D,E and G since B,F form the address bus and C forms the data bus to the EPROM. Each register is bit defined in that each bit configures one feature of the respective port , however all the data registers and data direction registers work on the same principle.


Related Discussions:- Parallel ports - micro-controller

What is functional modelling, What is  Functional Modelling  We know ...

What is  Functional Modelling  We know that Data flow modelling is an ordinary technique used for analysis of a problem in software engineering. It is very useful for analyzi

Data base, why to learn data base?

why to learn data base?

Which term is associated with snmp, Which term is associated with SNMP? ...

Which term is associated with SNMP? MIB is related with SNMP.

Explain about the client/server computing, Explain about the Client/Server ...

Explain about the Client/Server Computing? Although there are different various configurations, various hardware and software platforms and even various network protocols into

What makes a circuit ''digital''?, All digital devices are made from circui...

All digital devices are made from circuits whichcan be switched between two possible states.These two states are represented by a voltagelevel at the output of the circuit e.g. 0V

Cookies, basic purpose of cookies

basic purpose of cookies

Determine the process of action-object matrix, Determine the Process of act...

Determine the Process of action-object matrix Check for multiple models  Recognize objects Design user object model diagram Define user object actions De

Algebraic method for simplification of boolean expressions, Define Algebrai...

Define Algebraic method for Simplification of the Boolean Expressions This method is depend on the by knowledge of the Boolean algebra. Expression can be making simpler by usin

Truth tables, Any function can be expressed in a truth table.A truth table ...

Any function can be expressed in a truth table.A truth table lists all possible combinations ofinputs and gives the output produced in eachcase.Truth tables must include all combin

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd