Data Pointer (DPTR) - SFRs in MCS-8051 - MCQs with Answers

Data Pointer (DPTR) - SFRs in MCS-8051 - MCQs with Answers


Q1. Which locations of 128 bytes on-chip additional RAM are generally reserved for special functions ?

a. 80H to 0FFH
b. 70H to 0FFH
c. 90H to 0FFH
d. 60H to 0FFH

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ANSWER: a. 80H to 0FFH



Q2. Which commands are used for addressing the off-chip data and associated codes respectively by data pointer?

a. MOVX & MOVC
b. MOVY & MOVB
c. MOVZ & MOVA
d. MOVC & MOVY

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ANSWER: a. MOVX & MOVC



Q3. Which instruction find its utility in loading the the data pointer with 16 bits immediate data?

a. MOV
b. INC
c. DEC
d. ADDC

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ANSWER: a. MOV



Q4. What is the maximum capability of addressing the off-chip data memory &off-chip program memory in a data pointer ?

a. 8K
b. 16K
c. 32K
d. 64K

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ANSWER: d. 64K


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