21) How many wires does it take to ground)? connect an 12C device to our process

Question

21) How many wires does it take to ground)? connect an 12C device to our processor (not including power and a) 2 b) 4 c) 3 d) 6 e) 1 22) If the LCD panel on a Discovery Kit on a Discovery Kit does not display any message at all, what is.not the cause of the problem? a) GPIOA b) pause()0 subroutine has too short time set. c) LCD_contrast0) is not set properly. d) LCD_clear() is not set properly. e) The message to dis port is not properly configured for 12C2 interface 23) If LCD panel message does not clear after display, what is a possible cause? a) GPIOA port is not properly configured for 12C2 interface. b) pause() subroutine has too short time set. c) LCD_contrast) is not set properly. d) LCD_clear) is not set properly. e) The message to display is not set properly. 24) If LCD panel displays the first character of the message illegible, what is the cause of the problem? a) GPIOA port is not properly configured for 12C2 interface. b) pause() subroutine has too short time set. c) LCD_contrast() is not set properly. d) LCD_clear() is not set properly. e) The message to display is not set properly. What is contained in an Interrupt Vector? a) Interrupt Service Routine Code b) Interrupt Priority c) Interrupt Number d) Return Address e) Address of Interrupt Service Routine

Explanation / Answer

There are two many questions in this questions. Answereing only first 5 questions

21. Answer is (a)

We need two wires to connect I2C and processor, one clockline and one dataline

22, Answer is (d)

LCD_Clear() is not set properly is not the cause for not displaying anything on screen

23. Answer id (d)

LCD_Clear() is not set properly is the reasoin for not clearing the display

24. Answer id (c)

if LCD_Contrast() is not set properly then the character on the screen lokks fady(illegible)

25. Answer is (c)

Interrut vector contains an Interrupt number which is reserved for a specific purpose

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