In this question, we want to design a digital system that switches on the light and heating system automatically in an office. Three sensors are available: a temperature sensor, a presence sensor and a light sensor. (b) The temperature sensor output, noted T, is equal to a logic 1' if the temperature in the office is over a set temperature. The presence sensor, represented by a binary variable noted P, is 1' if someone is in the office. The light sensor, associated to a binary variable LS, is equal to 'l' if the natural light level if above a given threshold. The light in the office should be switched on if someone is in the office and the natural light is below the given threshold. The heating system is turned on if someone is in the office and the temperature is below the given set temperature. Find the Boolean expression to have the light on (you can use a binary variable L for the light with the following logic: L = 1 if the light is on). (i) Find the Boolean expression to have the heating on (you can use a variable H with the following logic: H (1i) I if the heating is on): %3D
Instructions and Operation
Nowadays, electrical engineers are required to evolve their practices by incorporating embedded processes, microcontrollers, digital signal processors, and so on. These processors are beneficial in many ways and have changed the perspective of electronic design.
Subroutine Instruction
Subroutine instruction is defined as the instructions used in the programming language in a sequence form saved in memory. They are used to doing a specific task. Subroutine instruction is called a unit that instructs to perform some needed task. There are many programming languages in which subroutine instructions are used but have a different identity or name, such as method, function, subprogram, routine, etc. Subroutine or sub-program is designed or coded as they can be called multiple times while executing the program.
Classification of Buses
A bus inside a microprocessor is a collection of wirelines that contain related information. A group of wires required for communication among the microprocessor and peripherals is known as a system bus. A bus is an electrical or digital passage across which bits are transferred between a variety of computer elements. It mainly links all the internal parts to the CPU (Central Processing Unit) and main memory. The width or size of any bus is crucial since it affects the amount of data that is transferred at a certain time period. Buses always transmit data parallelly, in a 32-bit bus, the information is supplied over 32 wirelines simultaneously and each bus comprises a clock speed measurable in MHz. The various types of buses inside a microprocessor are address bus, data bus, and control bus.
Execution of Instruction
A sequence of instructions makes up a program stored in a computer's memory unit. The CPU executes these instructions by going through a cycle for each instruction. The instruction cycle in a simple computer includes the steps listed below:
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