Question

1) Please answer FULL question (A-D) multiple choice. Double check answer and work to ensure it is correct for thumbs up.

A) If TRISB = 0xFFF8, which pins are set as output?

a) RB15, RB14, RB13

b) RB0, RB1, RB2

c) All pins except RB15,RB14, RB13

d) All pins except RB0,RB1, RB2

B) If you are writing to a set of I/O pins on RB0-RB15, should you write to PORTB or LATB?

a) PORTB

b) it doesn't matter they'll both work

c) LATB

C) What is the size of the 16 working registers (in number of bits) used in the PIC24FJ64GA002?

a)24

b) 16

c) 32

d) 8

D) How many cycles delay will the following code introduce when called?

wait_cycles:

nop

repeat #1

nop

nop

return

What is the correct integer number?

Answer 1

A)

TRISB is the PORTB data direction register whose pin congiguration is like

TRISB = (15:0), means the first bit is for 16th pin and last bit is for 1st pin.

In TRISB register if there is

1 = it means pin is set as input

0 = pin set to output

So in above problem

TRISB = 1111 1111 1111 1000

So here the first 3 pins are declared as output and all other as input

So RB0, RB1, RB2 are output

So B option is correct

B)

LATB is the register which is used to write data on the pins of the controller, whereas PORTB register is used to declare as whether pin will work as input or output.

So LATB is the answer

So option C is correct

C)

In the controller working registers are called as data registers and there are 16 in number is this micro controller.

So each register has a built in range of 0-15 means each register is of 16 bit ranging from 0:15.

So working registers are of 16 bits

So option B is correct