Que: 1 8051 series of micro controllers are made by which of the following companies?
|
| a. Atmel |
| b. Philips |
| c. None of the mentioned |
| d. Both of the mentioned |
(d). Both of the mentioned
Que: 2 AT89C2051 has RAM of:
|
| a. 128 bytes |
| b. 256 bytes |
| c. 64 bytes |
| d. 512 bytes |
Que: 3 8051 series has how many 16 bit registers?
|
| a. 2 |
| b. 3 |
| c. 1 |
| d. 0 |
Que: 4 When 8051 wakes up then 0x00 is loaded to which register?
|
| a. DPTR |
| b. SP |
| c. PC |
| d. PSW |
Que: 5 When the micro controller executes some arithmetic operations, then the flag bits of which register are affected?
|
| a. PSW |
| b. SP |
| c. DPTR |
| d. PC |
Que: 6 How is the status of the carry, auxiliary carry and parity flag affected if write instructionMOV A,#9CADD A,#64H
|
| a. CY=0,AC=0,P=0 |
| b. CY=1,AC=1,P=0 |
| c. CY=0,AC=1,P=0 |
| d. CY=1,AC=1,P=1 |
Que: 7 How are the bits of the register PSW affected if we select Bank2 of 8051?
|
| a. PSW.5=0 and PSW.4=1 |
| b. PSW.2=0 and PSW.3=1 |
| c. PSW.3=1 and PSW.4=1 |
| d. PSW.3=0 and PSW.4=1 |
Que: 8 If we push data onto the stack then the stack pointer
|
| a. increases with every push |
| b. decreases with every push |
| c. none of the mentioned |
| d. both of the mentioned |
(a). increases with every push
Que: 9 On power up, the 8051 uses which RAM locations for register R0- R7
|
| a. 00-2F |
| b. 00-07 |
| c. 00-7F |
| d. 00-0F |
Que: 10 How many bytes of bit addressable memory is present in 8051 based micro controllers?
|
| a. 8 bytes |
| b. 32 bytes |
| c. 16 bytes |
| d. 128 bytes |