Microprocessor Identify the communication interfacing device from the following 8257 8255 8251 8155 8257 8255 8251 8155 ANSWER DOWNLOAD EXAMIANS APP
Microprocessor The operating modes of 8255 A are called Mode 0 and mode 1 Mode 0, mode 1 and mode 2 Mode 0, mode 2 and mode 3 Mode 0 and mode 2 Mode 0 and mode 1 Mode 0, mode 1 and mode 2 Mode 0, mode 2 and mode 3 Mode 0 and mode 2 ANSWER DOWNLOAD EXAMIANS APP
Microprocessor If m is a power of 2, the number of select lines required for an m-input mux is: log2 (m) 2^m m 2*m log2 (m) 2^m m 2*m ANSWER DOWNLOAD EXAMIANS APP
Microprocessor HLDA signal in 8085 performs the following operation: Indicates that the CPU has received the HOLD request and that it will relinquish the bus in the next clock cycle. Indicates that the CPU has not received the HOLD request. Indicates that another master is requesting the use of the address and data buses. Hold the data in the accumulator until the microprocessor is turned OFF. Indicates that the CPU has received the HOLD request and that it will relinquish the bus in the next clock cycle. Indicates that the CPU has not received the HOLD request. Indicates that another master is requesting the use of the address and data buses. Hold the data in the accumulator until the microprocessor is turned OFF. ANSWER DOWNLOAD EXAMIANS APP
Microprocessor While using a frequency counter for measuring frequency, two modes of measurement are possible: Period time Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4MHz, the crossover frequency is given by 2 Khz. 2 Mhz. 1Khz. 8 Mhz. 2 Khz. 2 Mhz. 1Khz. 8 Mhz. ANSWER DOWNLOAD EXAMIANS APP
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