Microprocessors And Microcontrollers - Study Mode
[#61] A 8255 chip is selected when A2 to A7 bits are all 1. The address of port C
Correct Answer
(C) FE
[#62] Consider the following loop: MOV CX, 8000H L1 : DEC CX JNZ L1 The processor is running at 14.7456/3 MHz and DEC CX requires 2 clock cycles and JNZ requires 16 clock cycles. The total time taken is nearly
Correct Answer
(B) 0.12 s
[#63] Consider the following registers: 1. Accumulator and B register 2. B and C registers 3. D and E registers 4. H and L registers Which of these 8-bit registers of 8085 µP can be paired together to make a 16-bit register?
Correct Answer
(B) 2, 3 and 4
[#64] What will be the content of Accumulator, Register-B and Overflow flag (OV) after execution of following 8051 micro-controller assembly code? MOV A, #65h MOV 0F0h, #14h DIV AB DIV AB
Correct Answer
(B) A = 05h, B = 00h, OV = 0
[#65] The stack pointer will be affected by instruction: 1. PUSH PSW 2. CALL ADDR 3. XTHL 4. RST n
Correct Answer
(C) 1, 2 and 4 only