Question

WIL JI I IM 8. In the RS-232 standard, which of the following represents logic o? (a) -3V - +3V (b) R egister -25V ~ +25V (c) +3V ~ +25 V (d)-25V ~ 3V ( 9. Which of the following signal is used by a computer to accept incoming call in the RS- 232 standard? (a) DTR (b) DSR (C) RTS (d) CTS 10 What causes the framing error in the RS-232 communication? (a) the missing of the start bit in a frame (b) the missing of the stop bit in a frame (C) the missing of parity error (d) the occurrence of receiver overrun ( 11 For the MCP4922 DAC, if the gain is set to 1 and the reference voltage is set to 5 V, what value can generate 3 V output: (a) 2000 (b) 1000 (C) 1457 (d) 2457 ( )12 Suppose 16 times oversampling is selected and the frequency of the clock source to the USART module is 64 MHz, what value should be written into the USART->BRR register in order to set baud rate to 38400? (a) 1667 (b) 2667 (c) 3667 (d) 4667 ( 13. Which of the following statements is wrong? (a) infrared light (IR) can be used in remote control (b) IR can be used in point-to-point data communication (c) the wavelengths of IR are longer than those of visible lights (d) IR can be used in 5 G communication ( )14. The IR modulation scheme is referred to as (a) 58-kHz modulation (b) 48-kHz modulation (C) 38-kHz modulation (d) 28-kHz modulation ( 15. The maximum value for the NBYTES field in the 12Cx->CR2 register is (a) 255 (b) 127 (c) 511 (d) 240

Answer 1

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By The RS-232 standard a logic high (1) Is represented by a negative Voltage anywhere from -3 to 25 v. While a logic low CÓ') transmits a positive voltage that can be anywhere from t3 to +25 Su, option ©