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The register that provides control and status information about serial port is
a) IP
b) IE
c) TSCON
d) PCON and SCON
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Answer: d
Explanation: The registers, PCON and SCON contain control and status information about serial port.
The register that provides control and status information about counters is
a) IP
b) TMOD
c) TSCON
d) PCON
……….
Answer: b
Explanation: The registers, TMOD and TCON contain control and status information about timers/counters.
The registers that contain the status information is
a) control registers
b) instruction registers
c) program status word
d) all of the mentioned
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Answer: c
Explanation: The set of flags of program status word contains the status information and is considered as one of the special function registers.
Which of the following register can be addressed as a byte?
a) P1
b) SCON
c) TMOD
d) TCON
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Answer: c
Explanation: The registers, TMOD, SP, TH0, TH1, TL0, TL1 are to be addressed as bytes.
Which of the following is bit-addressable register?
a) SBUF
b) PCON
c) TMOD
d) SCON
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Answer: d
Explanation: The registers, accumulator, PSW, B, P0, P1, P2, P3, IP, IE, TCON and SCON are all bit-addressable registers.
The PCON register consists of
a) power mode bit
b) power idle bit
c) power ideal bit
d) power down bit and idle bit
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Answer: d
Explanation: The power control register, PCON consists of power down bit and idle bit which activate the power down mode and idle mode in 80C51BH.
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