Explain briefly the characteristics of the program invisible registers. - Intel Microprocessor

Explain briefly the characteristics of the program invisible registers.

- The program invisible registers are used to access and specify the address tables of global and local descriptor tables.

- Since these types of register cannot be accessed directly by a program they are called invisible registers.

- The Global Descriptor table register contains the limit and the base addresses for the descriptor table. The same applies for the Interrupt descriptor table register.

- Since the maximum length is limited to 64 Kbytes the limit of each descriptor table is limited to 16 bits.

- The GTDR is loaded with the address of the global descriptor table whenever a protected mode operation is required.