Describe the difference between parallel and serial data input/output? Which is

Question

Describe the difference between parallel and serial data input/output? Which is better? Describe two general methods to manage data I/O? which does HCS12 support? Describe the types of registers needed to support I/O on a MCU? HCS 12 Port Interface Module (PIM) capability List the ports support general purpose parallel I/O? List the port that supports timer functions List the ports that can support external interrupts List the ports that can support serial data transfer. List the ports that can Analog to Digital Input and Pulse Width Modulation output How is the direction of data flow controlled on the PIM? Write a line of code that sets Port B to all outputs. Write a piece of code that sets Port A, pins 0 to 3 as input and pins 4-7 as output. Show how to enable pull up resistors on port A and port B. What must the value of DDRA and DDRB be set to when using pull up resistors? Explain: What is a primary purpose of pull up resistors? Show how to enable pull up resistors on port P. Show how to enable reduced drive control on port B. What must the values of DDRB be set to when reduced drive control. Explain: What is a primary use of reduced drive circuits? Show how to enable reduced drive on Port T.

Explanation / Answer

A serial communication device transfers data in bits in the same direction. A parallel communication device sends data in multiple bits to the same direction. In serial communication a word of eight bits in length is sent sequentially, and is received after all eight bits are sent, one at a time. The bits are then assembled back into one byte which is the initial communication. In parallel communication the eight bits are transferred in corresponding 8 channels, every channel transmits a bit, and a byte of data is received simultaneously.

Parallel communication devices are faster than their serial counterparts. A serial communication device sends data in bits, and at the end the bits harmonize to form a byte of data. A parallel communication device sends and receives the same amount of data simultaneously, thus making it faster. The parallel device has eight wires connected to the port which transmits all the 8 bits through the eight wire connectors simultaneously. This means that a parallel device transmits an 8 bits data within the same time a serial device transmits a single bit.

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