What are the pins in 8051 microcontroller?
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What are the pins in 8051 microcontroller?
8051 has four I/O ports wherein each port has 8 pins which can be configured as input or output depending upon the logic state of the pins. Therefore, 32 out of these 40 pins are dedicated to I/O ports. The rest of the pins are dedicated to VCC, GND, XTAL1, XTAL2, RST, ALE, EA’ and PSEN’.
What is the pin 10 of 8051?
It is internally pulled up, bi-directional I/O port. Pin 9 − It is a RESET pin, which is used to reset the microcontroller to its initial values. Pins 10 to 17 − These pins are known as Port 3. This port serves some functions like interrupts, timer input, control signals, serial communication signals RxD and TxD, etc.
What is pin number 31 in 8051 microcontroller?
Pin 30 (ALE/PROG): Pin 30 is the Address Latch Enable Pin. Using this Pins, external address can be separated from data (as they are multiplexed by 8051). During Flash Programming, this pin acts as program pulse input (PROG). Pin 31 (EA/VPP): Pin 31 is the External Access Enable Pin i.e. allows external Program Memory.
How many GPIO pins are there in 8051?
Pin configuration diagram of 8051 is shown below: Some manufacturers also introduced 20 pins 8051 with less number of input /output pins. As shown in the pinout diagram, it has 40 pins out of which 32 pins are dedicated to four GPIO ports.
Which register in 8051 is a 16-bit register?
Program Counter and Data Pointer The 8051 contains two 16-bit registers: the program counter (PC) and the data pointer (DPTR). Each is used to hold the address of a byte in memory.
What makes 8051 an 8-bit microcontroller?
8051 microcontroller is designed by Intel in 1981. It is an 8-bit microcontroller. It is built with 40 pins DIP (dual inline package), 4kb of ROM storage and 128 bytes of RAM storage, 2 16-bit timers. It consists of are four parallel 8-bit ports, which are programmable as well as addressable as per the requirement.
How many SFRS are there in MCS 51?
There are 21 Special function registers (SFR) in 8051 micro controller and this includes Register A, Register B, Processor Status Word (PSW), PCON etc etc. There are 21 unique locations for these 21 special function registers and each of these register is of 1 byte size.
What GPIO means?
General Purpose Input/Output
General Purpose Input/Output (GPIO)
How many flags are there in 8051?
Four of the flags are called conditional flags, which means that they indicate a condition which results after an instruction is executed. These four are CY (Carry), AC (auxiliary carry), P (parity), and OV (overflow)….8051 Flag Bits and PSW Register.
| CY | PSW.7 | Carry Flag |
|---|---|---|
| OV | PSW.2 | Overflow Flag |
| – | PSW.1 | User definable FLAG |
How many GPR are there in 8051?
The 8051 has 4 registers bank . The B0, B1, B2, and B3 stand for banks and each bank contains eight general purpose registers ranging from ‘R0’ to ‘R7’.
How many bits are there in 8051?
8051 microcontroller is designed by Intel in 1981. It is an 8-bit microcontroller. It is built with 40 pins DIP (dual inline package), 4kb of ROM storage and 128 bytes of RAM storage, 2 16-bit timers.
