Test: Register Set Of 8051 - Computer Science Engineering (CSE) MCQ

The registers, PSW, TCON and Accumulator are 8-bit registers.

The registers, TMOD, SP, TH0, TH1, TL0, TL1 are to be addressed as bytes.

The registers, accumulator, PSW, B, P0, P1, P2, P3, IP, IE, TCON and SCON are all bit-addressable registers.

The registers, DPH and DPL are the higher and lower bytes of a 16-bit register DPTR.

The Data pointer(DPTR) is used for accessing external data memory which means that it includes both DPH and DPL.

At a time, only one of the four register banks can be accessed.

The 32, 8-bit registers are divided into four groups of 8 registers each, called register banks.

If RS1=1, RS0=0, then the register bank selected is register bank 2.

If RS1=1, RS0=1, then the register bank selected is register bank 3. If RS1=0, RS0=0, then selected bank is register bank 0.

The power control register, PCON consists of power down bit and idle bit which activate the power down mode and idle mode in 80C51BH.