MICROCONTROLLER AND EMBEDDED SYSTEM SET-4

1. With XTAL = 11.0592 MHz, what value should be loaded into TH 1 to have a 28,800 baud rate'? Give the answer in both decimal and hex.

1. 1, 0xff 
2. -1 , 0xff 
3. -2, 0xfd
4. -3, 0xfd 

2. Which register is used to set the data size and other framing information such as the stop bit for the second serial port?

1. SBUF 
2. TCON 
3. SCON 
4. PCON

3. True or false. RS232 is not TTL compatible

1. True 
2. False 

4. Calculate the time it takes to transfer 10,000 characters if we use 9600 bps. [Assume Asynchronous frame structure as 8-bit data, 1 stop bit, no parity ].

1. 10.4 seconds 
2. 1.04 seconds 
3. 400 Seconds 
4. Data insufficient to find 

5. SCON stands for____ and it is a(n) __ -bit register. 

1. Serial On, 1 
2. SCON state, 8 
3. Serial On, 8 
4. Serial Control, 8

6. Beside reset, how many interrupts do we have in the 8051? 

1. 6 
2. 3 
3. 4 
4. 5

7. Both the ADC0804 and ADC0808/0809 are __ -bit converters. 

1. 10 
2. 8 
3. 12 
4. 16

8. For the LCD to recognize information at the data pins as data, RS must be set to __ (high, low). 

1. high 
2. low

9. What voltage levels are used for binary 0 in RS232?

1. -3V to -25V 
2. +3V to +25V 
3. 0V 
4. 5

10. If XTAL = 11.0592 MHz, what frequency is used by the timer to set the baud rate?

1. 28,800 Hz 
2. 9600 Hz 
3. 4800 Hz 
4. Data Insufficient to determine