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Within the Microelectronics centre we support the following microcontrollers 68HC11, 80C51 and the PIC16C5xx series; we have a set of software tools and emulators to help debug high and low level software /hardware designs. Within the demonstration we shall see a elementary program to chase lights on a parallel port (The knight rider car). The code is available in machine code and C as shown later. You will see the use of the compiler and assembler (IAR program) on a 68HC11 target machine. C code Program void main() { /* Author Mr James Mc Carren Date : 1 st March 1996 Fuctions used : delay Purpose : To Chase lights on port A Target : 68HC11 microcontroller Version : 1.0 Modifications : None */ unsigned char *Paddr,*Padr; unsigned char data; int x,i,del; /* Declare the port a pointers */ Padr = (unsigned char *)0x0; Paddr = (unsigned char *)0x1; /* Port A all outputs */ *Paddr =0xff; for(;;) { data = 0x1; for (i=0;i<=7;i++) /* Shift 8 times */ { for (del = 0;del<=0x3fff;del++); /* Very long delay */ *Padr = data< } } }
The CCITT standard bandwidth for speech is: (A) 20000 Hz (B) 15000 Hz (C) 7000 Hz (D) 3400 Hz Ans:
Why do we need DMA? DMA is used to transfer the block of data directly among an external device and the main memory without the continuous intervention by the processor.
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Sort the following list using selection sort technique, displaying each step. 20,12,25,6,10,15,13
What is a Shift Register? Ans: Shift Register: A register wherein data finds shifted towards left or right while clock pulses are applied is termed as a Shift Register.
How is basic authentication worked? When an exact resource has been protected using fundamental authentication, Apache sends a 401 Authentication needed header along with the r
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