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What is the address range of SFRs?

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What is the address range of SFRs?

(a) 80h to feh

(b) 00h to ffh

(c) 80h to ffh

(d) 70h to 80h

I have been asked this question at a job interview.

Enquiry is from Microcontroller (8051) in division Prototyping Embedded Devices of IOT

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Right option is (c) 80h to ffh

The explanation is: In 8051 there certain registers which uses the RAM addresses from80h to ffh. These are called as Special Function Registers. Some of the SRFrs are I/o ports and control operations as TCON, SCON, PCON.

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