What is bit addressable and byte addressable?
They are not really using the terms right, byte addressable is what we are used to an address represents a unique byte in memory or the memory space. Bit addressable would mean that each bit in the memory space has a unique address, which is not the case.
Is memory byte addressable or word addressable?
In reality, memory is only byte addressable. It means: A binary address always points to a single byte only. A word is just a group of bytes – 2 , 4 , 8 depending upon the data bus size of the CPU.
Which register of 8051 is known as both bit and byte addressable?
PSW register is both bit and byte addressable. The physical address of PSW starts from D0H.
Which of the following SFR is bit addressable?
Which of the following is bit-addressable register? Explanation: The registers, accumulator, PSW, B, P0, P1, P2, P3, IP, IE, TCON and SCON are all bit-addressable registers. Explanation: The registers, DPH and DPL are the higher and lower bytes of a 16-bit register DPTR.
Is bit addressable memory?
Bit-addressable objects are objects that may be addressed as words or as bits. Only data objects that occupy the bit-addressable area of the 8051 internal memory fall into this category. The above example represents declarations, not assignments to the bits of the ibase and bary bdata variables.
What are bit addressable memory locations?
The bit-addressable RAM locations are 20H to 2FH. These 16 bytes provide 128 bits of RAM bit-addressability since 16×8= 128. They are addressed as 0 to 127 (in decimal) or 00 to 7FH.
What is bit-addressable?
Bit-addressable objects are objects that may be addressed as words or as bits. Only data objects that occupy the bit-addressable area of the 8051 internal memory fall into this category.
What is the byte-addressable memory?
Byte addressable memory refers to architectures where data can be accessed and addressed in units that are narrower than the bus. The 386SX, which addresses memory in 8-bit units but can fetch and store it 16 bits at a time, is termed byte-addressable.
Which SFR from following is not bit addressable?
Embedded Systems – SFR Registers
| Byte Address | Bit Address | |
|---|---|---|
| 8A | Not bit Addressable | TL0 |
| 89 | Not bit Addressable | TMOD |
| 88 | 8F | TCON |
| 87 | Not bit Addressable | PCON |
Which of the following SFR is not bit addressable Mcq?
4. Which of the following registers are not bit addressable? Explanation: PCON register is not a bit addressable register.
Are all SFRs bit addressable?
The 8051 Microcontroller four Ports which can be used as Input and/or Output. Each bit in these SFRs corresponds to one physical Pin in the 8051 Microcontroller. All these Port Registers are both Bit Addressable and Byte Addressable.
Why is memory byte addressable and not bit addressable?
The reason why the hardware isn’t bit addressable is the cost and complexity to address to that level of granularity isn’t justified. You need more wires the more accurately you address. A lot of computers aren’t really byte addressable either. They tend to move memory around in bigger chunks, 64 bytes is common.