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Microprocessor

Microprocessor
In one’s complement 8 bit representation 11111111 represents

-1
1
+0
-0

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Microprocessor
During OPCODE fetch the state of S0 and S1 is

 10
 00
 01
 11

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Microprocessor
S0 and S1 pins are used for

 indicating the processor’s status
 acknowledging the interrupt
 serial communication
None of these

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Microprocessor
Total number of modes the 8253 can work

 6
 8
 4
 12

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Microprocessor
While STC instruction executes,

 only carry flag will be affected.
 no flags will be affected.
 all flags will be affected.
 only carry and zero flags will be affected.

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Microprocessor
The 8085 microprocessor enters into bus idle machine cycle whenever

 DAD RP instruction is executed
 RST 7.5 is recognized
 INTR interrupt is recognized
None of these

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