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... directives, arithmetic, loops, branch, shift/rotate, boolean logic, bit test... Control unit: hardware instrucion logic. Memory: place to store software ...
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STORE instructions save the contents of a CPU register into a memory location. ... location to store contents of the CPU register. For example, ldaa 0,X. staa ...
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Simplifies the design of a complex program by using the divide-and-conquer approach ... blo m_less_n ; it is fine if m n. exg d,x ; swap m and n ...
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ECE3120: Computer Systems Chapter 6: Interrupts Dr. Xubin He http://iweb.tntech.edu/hexb Email: hexb@tntech.edu Tel: 931-3723462, Brown Hall 319 Prev
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the exception of the most significant byte which will receive a 0. ... Changing a few bits are often done in I/O applications. ...
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I/O completion, timer time-out, illegal opcodes, arithmetic overflow, divide-by-0, ... mechanism establishes these initial conditions for the computer system. ...
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Time-of-day tracking. Periodic interrupt generation. Waveform generation. 3 ... Setting the bit 4 will enable fast timer flag clear function. ...
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It is most common to have four or eight switches in a DIP package. ... keyB jmp db_keyB. scan_r3 movb #$7F,keyboard ; scan the row containing keys CDEF ...
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Interfacing with output devices. 3. Electrical Characteristic. Consideration for I/O Interfacing ... out from the driving device when the driving voltage is ...
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I/O devices are pieces of equipment that exchange data with a computer. ... 6. SPI0: use pins PS7~PS4. 7. SPI1: use pins PH3~PH0. 8. SPI2: use pins PH7~PH4 ...
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A dual-channel 8-bit D/A converter made by Analog Devices. The AD7302 converts an 8-bit digital value into an analog voltage. ... to be a memory-mapped device. ...
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Can be used to latch the value of IC registers and the pulse accumulators to ... The action of latching can be periodic or only once. ...
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The 68HC12 family is an upgrade of the popular 68HC11 8-bit microcontroller family. ... The assembly/disassembly process can be terminated by a period. ...
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The HCS12 standard timer system has a 16-bit pulse accumulator PACA. ... Example 8.13 Write a program to measure the duration of an unknown signal ...
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Assemblers directives db, dc.b, fdb are used to define arrays of 8-bit elements. ... max rmb 1 ; maximum index value for comparison. min rmb 1 ; minimum index ...
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Microcontroller. A computer implemented on a single VLSI chip. ... Features of 68HCS12 microcontroller. 16-bit CPU ... product, not the microcontroller itself. ...
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stab 0,y ; save the code and increment the pointer. clr 1,y ; terminated the string with NULL ... stab 2,y ; save the least significant digit. xgdx ; swap the ...
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One 16-bit buffer register for each of the input capture channels. Four 8-bit pulse accumulator ... TCNT overflows. 9. Next... OC function. Read Chapter 8.5-8.7 ...
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Pull up to high. Pull down to low. Toggle. 4. Operation of the Output-Compare Function ... movb #$03,TCTL2 ; select pull high as pin action ...
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Each PWM channel has a period register, a duty cycle register, a control ... Clock SB is derived by dividing the clock B by an even number ranging from 2 to 512. ...
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The reception of an ASCII carriage return ($0D) terminates the reception of ... are already eight prime numbers in the current line, then also output a carriage ...
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A new word is identified by skipping over the white space characters. ... string_x fcc 'Yellowstone is national park.' fcb 0. offset equ 15 ...
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Problem definition: Identify what should be done. - Develop the algorithm. Algorithm is the overall ... ldd $802 ; place the lowest 2 bytes of the minuend D ...
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ECE 2000: Introduction to Electrical and Computer Engineering ... Other digital devices:automobile control devices, medical indurstry, consumer elctronics ...
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A sequence of characters terminated by a NULL (ASCII code 0) or other ... string_x fcc 'Yellowstone is national park.' fcb 0. offset equ 15 ...
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