8081 MICROCONTROLLER ARCHITECTURE PDF

The following image shows the basic components of a Microcontroller. As all the components and a few other components are integrated on a single chip Integrated Circuit — IC , a Microcontroller can be considered as a Microcomputer or a Computer on — chip. It is usually implemented as Read Only Memory or ROM, where the Program written in to it will be retained even when the power is down or the system is reset. In this type of memory, the data can be erased and reprogrammed using special programming signals. When the microcontroller is powered on or manually reset, the processor executes a set of instructions from a pre-defined memory location address in the Program Memory.

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The interrupt flags are cleared when the processor branches to the interrupt service routine ISR. Memory Microcontroller requires a program which is a collection of instructions. This program tells microcontroller to do specific tasks.

These programs require a memory on which these can be saved and read by Microcontroller to perform specific operations of a particular task. The memory which is used to store the program of the microcontroller is known as code memory or Program memory of applications. The data memory of the is used to store data temporarily for operation is known RAM memory. BUS Basically Bus is a collection of wires which work as a communication channel or medium for transfer of Data.

These buses consists of 8, 16 or more wires of the microcontroller. Thus, these can carry 8 bits,16 bits simultaneously. Hire two types of buses that are shown in below Address Bus Data Bus Address Bus: Microcontroller has a 16 bit address bus for transferring the data.

It is used to address memory locations and to transfer the address from CPU to Memory of the microcontroller. Bank address or Register addressing mode.

Direct Addressing mode. Register indirect addressing mode. For this purpose, microcontroller has an on-chip oscillator which works as a clock source for Central Processing Unit of the microcontroller. The output pulses of oscillator are stable. Therefore, it enables synchronized work of all parts of the Microcontroller. These counters are again divided into a 8 bit register. The timers are used for measurement of intervals to determine the pulse width of pulses.

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8051 Microcontroller – Architecture and Block diagram explained

The interrupt flags are cleared when the processor branches to the interrupt service routine ISR. Memory Microcontroller requires a program which is a collection of instructions. This program tells microcontroller to do specific tasks. These programs require a memory on which these can be saved and read by Microcontroller to perform specific operations of a particular task.

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