Q1 (a) (b) A modern embedded processor is used in the engine management unit for a hybrid petrol/electric car - requiring precise measurement of engine emissions in real time. Discuss whether

single precision or double precision floating point arithmetic is most appropriate for the software running on this processor. [4] (c) (d) State the range of allowable values for the exponent and fraction of IEEE-754 single precision floating point numbers. [3] (e) Obtain the IEEE single precision representation for the number -15.62510 showing your working at each point of the analysis. [7] Explain the key differences between the IEEE-754 numbers Ox7f800000 and 0x7fc00000. [3] The code of figure Q1 is executed on a Freescale Kenetis Microcontroller. Assume that the function delayms (int n) creates a delay of n ms. i) ii) iii) Describe the purpose and action of the line PTB->PDDR = 0x080000 noting the pin on which it acts. [4] Why is the bitwise operation '=' not needed when acting upon the registers PCOR and PSOR? [2] } What changes would be necessary in this program so that the output would be observed on port B, pin 3? [2] #include void delayms (int n); int main (void) { SIM->SCGC5= PORTB->PCR [19] PTB->PDDR = 0x080000;" while (1) 1 PTB-PCOR= 0x080000; delayms (500) PTB-PSOR = 6x080000; delayms (500);