Sep 20, 2024 · In this tutorial, we will take a look at the 8051 Microcontroller Special Function Registers or SFRs. Internal RAM or Data Memory of the 8051 Microcontroller is divided into General Purpose Registers, Bit Addressable Registers, Register Banks …

Apr 15, 2020 · Control parameters in the 8051 microcontroller for Timers, Serial communication, and interrupts use Special registers known as special-purpose registers. The PCON register is responsible for managing the power modes of the 8051 microcontrollers. It is placed at the address 87H and is not bit addressable.

Jun 2, 2021 · In 8051 micro controller there are 21 Special function registers (SFR) 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.

In the 8051, register A, B, DPTR, and PSW are a part of the group of registers commonly referred to as SFR (special function registers). An SFR can be accessed by its name or by its address. The following table shows a list of SFRs and their addresses.

Nov 9, 2024 · Many 8051 variants include a Watchdog Timer (WDT) SFR, which can be used to prevent system lockups and ensure reliable operation in embedded systems. Example: Configuring and refreshing the Watchdog Timer

Jan 5, 2012 · 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.

Mar 25, 2023 · The Data Pointer (DPTR) SFR in the 8051 Microcontroller is a 16-bit register that holds the address of data in external memory. The DPTR is used to indirectly access data in external memory, allowing the microcontroller to read …

SFRs are accessed as if they were normal Internal RAM. The only difference is that Internal RAM is from address 00h through 7Fh whereas SFR registers exist in the address range of 80h through FFh. Each SFR has an address (80h through FFh) and a name.

Jun 3, 2023 · Programmers should not use the addresses in the range 80H to FFH (other than SFR) as it is used by INTEL CORPORATION for expansion functions of 8051. Direct Addressed Memory Address (SFR) Special Function Register

Dec 31, 2024 · A comprehensive guide on 8051 Microcontroller Special Function Registers (SFRs). Learn about 8051 SFRs, structure, reset values, addresses.