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Microcontroller has how many register banks?
32
8
16
4
4
The 8051 microcontroller architecture contains four register banks, designated as Bank 0, Bank 1, Bank 2, and Bank 3, located in the internal Data RAM. Each bank contains eight 8-bit general-purpose registers (R0-R7), totaling 32 registers accessible in the RAM space.
The 8051 microcontroller architecture contains four register banks, designated as Bank 0, Bank 1, Bank 2, and Bank 3, located in the internal Data RAM. Each bank contains eight 8-bit general-purpose registers (R0-R7), totaling 32 registers accessible in the RAM space.
TotalRegisters=4├Ч8=32
ActiveBankIndex=PSW[RS1,RS0]
The four banks are mapped into the lower 32 bytes of the 8051 internal RAM address space (00H to 1FH). At any given time, only one register bank is active, determined by the two bank-select bits (RS1 and RS0) in the Program Status Word (PSW) register. This bank switching mechanism allows for efficient context switching by changing the pointer in the PSW rather than moving register contents.
Total of 4 register banks are available in 8051.
Each bank contains 8 registers named R0 through R7.
Bank selection is done via the PSW register bits RS0 and RS1.
By default, Bank 0 is selected upon power-on or reset.
Facilitates rapid context switching between tasks.
Minimizes the need for push/pop operations during interrupts.
Consumes 32 bytes of the limited 128 bytes internal RAM.
Complexity increases if all banks are used simultaneously.
Interrupt Service Routines (ISRs).
Real-time operating systems (RTOS) task management.
Register banks are mapped to addresses 00H-1FH in the internal RAM.
If an application uses all 32 registers, the remaining RAM available for general data storage is reduced.
D is correct тАФ The 8051 microcontroller features exactly 4 register banks, each containing 8 registers (R0-R7).
Always remember that the PSW (Program Status Word) register holds the bank selection bits (RS1, RS0); changing these allows instant access to different register banks, which is a favorite topic in gate-level exams.