Question
Download Solution PDFThere are ______ register banks in the 8051 microcontroller.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe 8051 microcontroller has:
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4 register banks
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Each bank contains 8 general-purpose registers: R0 to R7
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So, a total of 32 registers (4 banks × 8 registers)
Details:
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The register banks are located in the lower 32 bytes (00H to 1FH) of the internal RAM.
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The current active bank is selected using RS0 and RS1 bits in the Program Status Word (PSW) register.
| RS1 | RS0 | Active Bank | Address Range |
|---|---|---|---|
| 0 | 0 | Bank 0 | 00H – 07H |
| 0 | 1 | Bank 1 | 08H – 0FH |
| 1 | 0 | Bank 2 | 10H – 17H |
| 1 | 1 | Bank 3 | 18H – 1FH |
Last updated on Jun 7, 2025
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