week_6_ecet__340_homework

# week_6_ecet__340_homework - Page 355 problems 3 4 6 12 Page...

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Page 355 problems 3, 4, 6, 12 Page 529 problems 1–5, Page 535 problems 1–11 3. Show the framing of the letter ASCII ‘Z’ (0101 1010), no parity, 1 stop bit. 1010110100 4. If there is no data transfer and the line is high, it is called ___________ (mark, space). Space 6. Calculate the overhead percentage if the data size is 7, 1 stop bit, no parity. 7 bit data + 1 stop bit + 1 start bit = 9 bits 2/9 × 100% = 22% 12. State the absolute minimum number of signals needed to transfer data between two PCs connected serially. Give their names. Three; RxD, TxD, Gnd 1. True or false. The SPI protocol writes and reads information in 8-bit chunks. True

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2. True or false. In SPI, the address is immediately followed by the data. True. 3. True or false. In an SPI write cycle, bit A7 of the address is LOW. False 4. True or false. In an SPI write, the LSB goes in first. False 5. State the difference between the single-byte and burst modes in terms of the CE signal. In single –byte mode after each byte the CE pin must go high before the next cycle .In burst mode, the CE pin stays low for the duration of the burst (multibyte) transfer . 1. True or false. In the HCS12, we have at least two sets of SPI modules. 2. True or false. The SPIxBR register is used for setting SCLK speed. True 3. True or false. In the HCS12, the highest SCLK is BusFreq/2. True 4. True or false. In transferring data, the use of SPISR is optional.
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