itft-Microcontriller 8051
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This document describes the pinout of the 8051 microcontroller. It lists the 40 pins of the 8051 and provides a brief description of the functions of some of the most important pins including ports P0-P3, the reset pin, oscillator pins, VCC, interrupt and counter pins, and pins for interfacing with external memory. The pins allow the 8051 to interface with external devices and memory and function as either inputs or outputs to expand its capabilities.
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A microcontroller is a single-chip microprocessor system consisting of a CPU, memory, and input/output ports. It can be considered a complete computer on a single chip. The 8051 was an early microcontroller developed by Intel for use in embedded systems. It had 4KB of program memory, 128 bytes of data memory, timers, counters, and I/O ports. The 8051 has separate memory spaces for program and data memory and its CPU, registers, timers and I/O ports allow it to monitor and control external devices.
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- Two 16-bit counters/timers, four 8-bit I/O ports, and interrupts.
- Registers including accumulator, B register, program status word, stack pointer, and data pointer.
- Timers, serial I/O, and I/O ports for input/output.
At89s52
The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K
bytes of in-system programmable Flash memory. The device is manufactured using
Atmel’s high-density nonvolatile memory technology and is compatible with the industry-
standard 80C51 instruction set and pinout. The on-chip Flash allows the program
memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer.
By combining a versatile 8-bit CPU with in-system programmable Flash on
a monolithic chip, the Atmel AT89S52 is a powerful microcontroller which provides a
highly-flexible and cost-effective solution to many embedded control applications.
The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes
of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a
six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator,
and clock circuitry. In addition, the AT89S52 is designed with static logic for operation
down to zero frequency and supports two software selectable power saving modes.
The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and
interrupt system to continue functioning. The Power-down mode saves the RAM contents
but freezes the oscillator, disabling all other chip functions until the next interrupt
or hardware reset
Microcontroller 8051 By Mitesh kumar
The document provides information about the 8051 microcontroller. It describes the basic components of a microcontroller including the CPU, memory, I/O ports, and timers. It explains the pin layout and functions of the 8051 microcontroller. Key components like registers, memory mapping, stack, and interrupts of the 8051 are summarized. Programming I/O ports and timers is also covered at a high level.
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itft-Microcontriller 8051
- 2. Pin Description of the 8051 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 RST (RXD)P3.0 (TXD)P3.1 (T0)P3.4 (T1)P3.5 XTAL2 XTAL1 GND (INT0)P3.2 (INT1)P3.3 (RD)P3.7 (WR)P3.6 Vcc P0.0(AD0) P0.1(AD1) P0.2(AD2) P0.3(AD3) P0.4(AD4) P0.5(AD5) P0.6(AD6) P0.7(AD7) EA/VPP ALE/PROG PSEN P2.7(A15) P2.6(A14) P2.5(A13) P2.4(A12) P2.3(A11) P2.2(A10) P2.1(A9) P2.0(A8) 8051 (8031)
- 3. Pin Description • Pin 1-8(port 1,p1.0 to p1.7): These are 8 pins of port 1. Each of these pins can be configured as input or output. • Pin 9(Reset): A positive voltage pulse on this pin resets the microcontroller. • Pin 10-17(Port3, P3.3 to P3.7): these are dual function pins. Similar to port 1, each of these pins can serve as universal input or output.
- 4. • Pin 18,19 (X1 ,X2): These are the input and output pins of internal oscillator. A quartz crystal is usually connected to these pins. • These 2 pins provide external clock. • Way 1：using a quartz crystal oscillator • Way 2：using a TTL oscillator • Pin 20(GND): Ground • Pin 21-28(Port2,P2.0 to P2.7): If there is no intention to use external memory then these port pins are configured as universal input/output. In case external memory is used then the higher address byte ie address A8-A15 will appear on this port.
- 5. Pins of 8051（1/4） • Vcc（pin 40）： • Vcc provides supply voltage to the chip. • The voltage source is +5V. • Pin 12(INT0): Interrupt 0 input • Pin 13(INT1): Interrupt 1 input • Pin 13(T0): Counter 0 clock input • Pin 14(T1): Counter 1 clock input • Pin 15(WR): Signal for writing to external additional RAM • Pin 16(RD): Signal for reading from external Ram.
- 6. Pins of 8051（3/4） • /EA（pin 31) • By applying logic 0 to this pin ,P2 and P3 are used for data and address transmission with no regards to whether there is internal memory or not. Otherwise by applying logic 1bto EA pin, the microcontroller will use both memories, first internal and afterwards external (if exists) . • PSEN（pin 29）：program store enable • If external Rom is used for storing program then it has logic 0 value every time the microcontroller reads a byte from memory.
- 7. Pins of 8051 • ALE（pin 30）：address latch enable • It is an output pin and is active high. • This pin is used when multiple memory chips are connected to the controller and only one of them needs to be selected.