Register bank selection in microcontrollers is determined by the RS1 and RS0 bits. These bits are part of the control register that controls the operation of the microcontroller.

The RS1 and RS0 bits are used to select one of the four register banks available in the microcontroller. Each register bank contains a set of general-purpose registers that can be used for storing data during program execution.

Explanation:
- The RS1 and RS0 bits have two possible values: 0 and 1.
- When RS1=0 and RS0=0, register bank 0 is selected.
- When RS1=0 and RS0=1, register bank 1 is selected.
- When RS1=1 and RS0=0, register bank 2 is selected.
- When RS1=1 and RS0=1, register bank 3 is selected.

In this case, RS1=1 and RS0=0, which means register bank 2 is selected.

Register bank 2 is typically used for storing data that needs to be preserved during subroutine calls or interrupts. It provides a separate set of registers that can be used without interfering with the main program's registers in register bank 0. This allows for efficient context switching and interrupt handling.

Each register bank has its own set of registers, including a program counter (PC) register, stack pointer (SP) register, and general-purpose registers (R0-R7). The selected register bank is used for accessing and manipulating these registers during program execution.

It's important to note that the specific configuration and usage of the register banks may vary depending on the microcontroller architecture and manufacturer. The RS1 and RS0 bits are just one example of how register bank selection can be implemented.