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Apr 2, 2024 · The 8051 Microcontroller Special Function Registers act as a control table that monitor and control the operation of the 8051 Microcontroller. If you observe in Internal RAM Structure, the Address Space from 80H to FFH is allocated to SFRs.
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. So, it required 21 unique locations for these 21 special function registers and the size of each register is of 1 byte.
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.
Apr 15, 2020 · The 8051 microcontroller has 256 bytes of RAM divided into two parts; a 128-byte general-purpose area and a 128-byte special function register space. The general-purpose register space stores all the data that generates during the execution of a program.
8051 Microcontroller’s Power Modes and is located at 87H of the SFR Memory Space. Using two bits in the PCON Register, the microcontroller can be set to Idle Mode or Power down Mode.
Special Function Register(SFR) in 8051 Microcontroller - The 8051 microcontroller consists of 256 bytes of RAM memory, which is divided into two ways, such as 128 bytes for general purpose and 128 bytes for special function registers (SFR) memory.
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.
The 8051 is a flexible microcontroller with a relatively large number of modes of operations. Your program may inspect and/or change the operating mode of the 8051 by manipulating the values of the 8051's Special Function Registers (SFRs). SFRs are accessed as if they were normal Internal RAM.
Special Function Registers - 8051 Microcontroller Tutorials - Special Function Registers, Types of SFRs, Non-Standard SFRs, What are SFRs?, Standard SFR Descriptions.
Its intended function is to hold a 16-bit address. It may be manipulated as a 16-bit register or as two independent 8-bit registers. Ports 0 to 3. P0, P1, P2, and P3 are the SFR latches of Ports 0, 1, 2, and 3, respectively.
