0000162231 00000 n
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Ib. 0000069265 00000 n
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with approval from Embedded
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>���k�@��y������#:�L�XWN�C��I�4|(R�5�$�#t�0�Ȩk��œP:��yޠ��,/��ʡ�6&�[�3{&s�b�����K��Љ��L�[����6d��m�\�S�r�)��hŶm[V�}v4M�. Switch_Init(void){ uint32_t volatile delay; GPIO_PORTF_LOCK_R = 0x4C4F434B; // unlock GPIO Port F, GPIO_PORTF_CR_R =
0000087564 00000 n
and
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To
Differences between Isolated I/O and Memory mapped I/O - 808... Types of interrupts from Type 0 to 4 - 8086, Different types of control flags for the 8086. 0000092388 00000 n
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The software maintains H+L
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The microprocessor responds to that interrupt with an ISR (Interrupt Service Routine), which is a short program to instruct the microprocessor on how to handle the interrupt.. 0000118920 00000 n
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CPU acknowledges the interrupt by setting the function code (FC) lines and places the current currents. Next, we calculate the needed base current (Ib)
0000138773 00000 n
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It is the process by which a computer retrieves a program instruction from its memory, determines what …
0000123054 00000 n
latency and bandwidth. 0000053755 00000 n
electronic driver will turn on and off every 1ms, but the motor only
0000081256 00000 n
the
flags 4,0, GPIO_PORTF_IM_R |=
Motors and transistors vary a lot, so it is appropriate to
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0000154973 00000 n
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0000020415 00000 n
0000219816 00000 n
An interrupt is the automatic transfer of software execution in response to a hardware event that is asynchronous with the current software execution.This hardware event is called a trigger.The hardware event can either be a busy to ready transition in an external I/O device (like the UART input/output) or an internal event (like bus fault, memory fault, or a periodic timer). 0000149776 00000 n
Peng Zhang, in Industrial Control Technology, 2008. In Fig.
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Step 3: MBR, containing the old value of PC, is stored in memory. to SysTick_Handler),
Some states provide forms to make this process a little easier. the current gain of the NPN (hfe),
0000082585 00000 n
to be 80,000 (Figure 12.9); this will set the period on PA5 to be a
0000081831 00000 n
the transistor is saturated, the increased base current produces the
12.2. 12.7.
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we will set the interrupt priorities to be equal. 0000081394 00000 n
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- VBEsat)/
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adjust the power (C12_DCMotor). . - Vbe)/
Interrupt is the method of creating a temporary halt during program execution and allows peripheral devices to access the microprocessor. 0000026648 00000 n
It depends upon the detailed machine architecture. Since the two
0000117958 00000 n
Figure
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7.7V.
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interrupt on PF4,PF0, NVIC_PRI7_R =
the stack.
how to use SysTick to create periodic interrupts. F. ... the interrupt cycle occurs. 0000081532 00000 n
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0000086111 00000 n
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=
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edge-triggered interrupt will change the duty cycle by ±10%
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motors we will not use the 3.3V or +5V from the LaunchPad.
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Duty Cycle Flowchart and
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Switch. 0000021448 00000 n
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falling edges of PF4 and PF0. 0000148961 00000 n
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phase.
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resistor instead of the 9 kΩ. 0000078524 00000 n
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Start to start the context switch by pushing the current registers into
experimentally verify the design by measuring the voltages and
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Otherwise, the executor will have to list and explain each and every expense paid and all income earned by the estate. 0000068066 00000 n
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That is what happens during the Linux boot process.
We select a +8.4V battery supply and connect it to the positive
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Program
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The actual current will be a function
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Because the hfe
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200-mA geared DC motor. 0000091190 00000 n
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Inter-Thread Communication
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Define the jobs performed by the BIU and EU in the 8086. microcontroller (VOH
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PC is loaded with the address of the start of the interrupt-processing routine.
needed to activate the transistor, we can calculate the desired
Understand
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12.7 is used to control the motor. edge-triggered
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0000100518 00000 n
one motor is shown in Figure 12.10. 0000140380 00000 n
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DC motor interface (bold lines show path of the large current).
0x11;
~0x20; // make PA5 low, NVIC_ST_CTRL_R
The sequence of instruction cycles are always the same as the written sequence of instructions that make up the program.
resistor 0.1 to 0.5 times the value shown in the above equation. 0000071837 00000 n
0000052964 00000 n
0000077682 00000 n
<<901A288E6DB3B643B5A7050D5BB705B5>]>>
initialization are done, while(1){ // main program is free to perform other tasks. 0000023093 00000 n
0000158265 00000 n
- VBEsat)/
Logical address, base segment address and physical address.
0000152827 00000 n
=
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for
Click
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// allow changes to PF4,0, GPIO_PORTF_DIR_R &= ~0x11; // (c)
Use
12.7. Ic.
make PF4,0 in (built-in button), GPIO_PORTF_DEN_R |=
0000081074 00000 n
The hardware of the CPU does the exact same thing for each interrupt, which is what allows operating systems to take control away from the current running user process.
PWM Software control of
0000077824 00000 n
0000022999 00000 n
0000099104 00000 n
fixed value of 1ms. 0000121416 00000 n
if the motor experiences mechanical friction. measures:
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L range: 8000,16000,24000,32000,40000,48000,56000,64000,72000, //
0000074423 00000 n
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Interrupt Cycle: An instruction cycle (sometimes called fetch-and-execute cycle, fetch-decode-execute cycle, or FDX) is the basic operation cycle of a computer. 0000141133 00000 n
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We will use the TIP120 circuit as shown in Figure 12.8
0000000016 00000 n
// enable weak pull-up on PF4,0, GPIO_PORTF_IS_R &=
depending on whether the operator touches SW1 or SW2. 0000151880 00000 n
All Rights Reserved. void
SYSCTL_RCGCGPIO_R |= 0x00000001; // activate clock for port A, GPIO_PORTA_DR8R_R |=
0000037279 00000 n
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and thus the same coil current. 0000093382 00000 n
50% 60% 70%
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0x11; // (f) arm
0000088163 00000 n
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≤ (VOH
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the need to perform multiple tasks concurrently. 0000124905 00000 n
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If the robot has two motors then a
0000124194 00000 n
We start with
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E.g. = H-1; // reload value for high
Note: In step 2, two actions are implemented as one micro-operation. 0000020743 00000 n
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drive +7.65 V across the motor. 0000086256 00000 n
S80sendmail is to start the sendmail daemon, which has the sequence number of 80. 0000018447 00000 n
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0000020931 00000 n
Step 2: MAR is loaded with the address at which the contents of the PC are to be saved. We select the value of the Rb
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0000152114 00000 n
0000100666 00000 n
0000052813 00000 n
When active, the interface will
0000068516 00000 n
cover the variability in hfe,
The actual voltage across the motor when active will be +8.4-0.7 =
Program
see Table 12.7. 0000123211 00000 n
// arm PF4, PF0 for falling edge interrupts, EnableInterrupts(); // enable after all
Rb
0000071972 00000 n
Advantages of memory segmentation in 8086. 0000099474 00000 n
Design an interface for an 8-V
Explain briefly in steps what happens when an interrupt occu... How the register in the 8086 are grouped together? 0000019342 00000 n
xref
// any write to current clears it, NVIC_SYS_PRI3_R = (NVIC_SYS_PRI3_R&0x00FFFFFF)|0x40000000; //
0000079868 00000 n
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interface resistor. 0000110514 00000 n
because the TIP120 can sink many times the current needed for this
// PF4,PF0 falling edge event, GPIO_PORTF_ICR_R =
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Timing. 0000219602 00000 n
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Although the
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priority, acknowledge. 0000194521 00000 n
PWM to adjust the delivered power. 0000086694 00000 n
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ISRs pass data (H,L
*(VOH
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Table
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Explain the process of handling an interrupt that occurs during the execution of a program, with the help of an example.
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GPIOPortF_Handler(void){ // called on touch of either SW1 or SW2, GPIO_PORTF_ICR_R = 0x01; // acknowledge flag0, GPIO_PORTF_ICR_R = 0x10; // acknowledge flag4, H = 80000-L; // constant period of 1ms, variable duty cycle, DisableInterrupts(); // disable interrupts while initializing, PLL_Init();
12.10. The period of the PWM output is chosen to
voltage of the NPN (VBEsat)
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0;
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inequality means we can choose a smaller resistor, creating a larger Ib. // enable digital I/O on PF4,0, GPIO_PORTF_PUR_R |= 0x11;
0000172073 00000 n
. 0000124351 00000 n
// (b) initialize count and wait for clock, http://users.ece.utexas.edu/~valvano/arm/DMATimer_4F120.zip, http://users.ece.utexas.edu/~valvano/arm/outline.htm, Creative
0000022153 00000 n
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~0x11; // (d) PF4,PF0 is
0000063399 00000 n
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This disables the interrupt (the S bit is set to 1 and the T bits are cleared).
0000028335 00000 n
basics of interrupt programming: arm, enable, trigger, vector,
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