What is bank switching in microcontroller?
What is bank switching in microcontroller?
Many modern microcontrollers and microprocessors use bank switching to manage random-access memory, non-volatile memory, input-output devices and system management registers in small embedded systems. Unlike memory management by paging, data is not exchanged with a mass storage device like disk storage.
What is microcontroller banking?
The bank register is a part of the RAM memory in the embedded microcontrollers, and it is used to store the program instructions. Each microcontroller consists of various memory banks, and each bank register consists of a unique address for recognizing the storage location.
Which instruction used to switch banks?
We can switch to the other banks using PSW register. D4 and D3 bits of the PSW are used to select the desired register bank, since they can be accessed by the bit addressable instructions SETB and CLR. For example, “SETB PSW.
How register banks are useful in context switching?
Register banks are useful when processing interrupts or when using a real-time operating system because the MCU can switch to a different register bank for a task or interrupt rather than saving all 8 registers on the stack. The MCU can then restore switch back to the original register bank before returning.
How does a bank switch work?
How switching bank accounts works. Your old bank talks to the new one, and everything is switched over seamlessly, including your balance, direct debits and salary. Once you’ve picked a new account, you’ll be asked to apply by filling in a few details about yourself and your finances.
Is bank a PIC microcontroller?
As some of you have noticed, the internal RAM in the PIC 16F appears to be arranged in “banks”. Each bank holds 128 RAM registers total. The first 128 RAM locations are in bank 0, the next 128 RAM locations are in bank 1, so on and so forth.
What is the size of SP register?
The register used to access the stack is called the SP (stack pointer) register. The stack pointer in the 8051 is only 8 bits wide, which means that it can take values of 00 to FFH. When the 8051 is powered up, the SP register contains value 07.
What are bank registers why bank registers?
A register bank is used for the programmable registers used by assembly language programmers. It can be viewed as the hardware equivalent of a software array. It has ports for reading and writing data given an index. Main memory and caches have similar interfaces for reading and writing data.
What is PSW register?
The Program Status Word (PSW) contains status bits that reflect the current CPU state. The 8051 variants provide one special function register called PSW with this status information. The 251 provides two additional status flags, Z and N, that are available in a second special function register called PSW1.
Why flag is also called PSW?
The program status word (PSW) register is an 8-bit register. It is also referred to as the flag register. The two unused bits are user-definable flags. Four of the flags are called conditional flags, meaning that they indicate some conditions that result after an instruction is executed.
