Contents
- 1 What is bit addressable and byte addressable?
- 2 What is the difference between byte addressable and word addressable?
- 3 Is Ram byte addressable or word addressable?
- 4 Is main memory byte-addressable?
- 5 What are the last 2 bits of a word address?
- 6 What is not bit addressable?
- 7 How is a word addressable different from a byte addressable system?
- 8 What does it mean when CPU is byte addressable?
- 9 Why are so many computers not bit addressable?
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.
What is the difference between byte addressable and word addressable?
Now we can clearly state the difference between Byte Addressable Memory & Word Addressable Memory. When the data space in the cell = 8 bits then the corresponding address space is called as Byte Address. When the data space in the cell = word length of CPU then the corresponding address space is called as Word Address.
Is Ram 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.
What does bit addressable mean?
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 Cx51 Compiler places variables declared with the bdata memory type into the bit-addressable area.
Is PSW bit addressable in 8051?
The PSW register is a bit and byte-addressable register. This register reflects the status of the operation that is carried out in the controller. The PSW register determines bank selection by an RS1 and RS0, as shown below.
Is main memory byte-addressable?
The basic unit of digital storage is called a bit, storing a single 0 or 1. The 386SX, which addresses memory in 8-bit units but can fetch and store it 16 bits at a time, is termed byte-addressable. The advantage of word addressing is that more memory can be addressed in the same number of bits.
What are the last 2 bits of a word address?
A word is two contiguous bytes starting at any byte address. A word thus contains 16 bits. The bits of a word are numbered from 0 through 15; bit 0 is the least significant bit. The byte containing bit 0 of the word is called the low byte; the byte containing bit 15 is called the high byte.
What is not bit addressable?
PCON register is not a bit addressable register.
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 |
What is use of TF1 bit in TCON register?
Timer Control Register (TCON): TCON is another register used to control operations of counter and timers in microcontrollers. It is an 8-bit register wherein four upper bits are responsible for timers and counters and lower bits are responsible for interrupts. TF1: The TF1 stands for ‘timer1’ flag bit.
How is a word addressable different from a byte addressable system?
Access of a single byte in a byte-addressable system requires only the issuing of a single address. In a 16–bit word addressable system, it is necessary first to compute the address of the word containing the byte, fetch that word, and then extract the byte from the two-byte word.
What does it mean when CPU is byte addressable?
Word addressing means that, the number of lines in the address bus in the processor is lesser than the number of bits in the word itself. If this machine is byte addressable, then the address bus of the CPU will have 32 lines, which enables it to access each byte in memory.
Why are so many computers 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.
Which is the only way memory is addressable?
Memory units are addressable. That is the only way we can use memory. In reality, memory is only byte addressable. It means: A binary address always points to a single byte only.