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MC33888 Datasheet(PDF) 20 Page - Motorola, Inc |
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MC33888 Datasheet(HTML) 20 Page - Motorola, Inc |
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20 / 32 page  33888 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 20 Figure 4. Single 16-Bit Word SPI Communication Figure 5. Multiple 16-Bit Word SPI Communication Serial Input Communication SPI communication is accomplished using 16-bit messages. A message is transmitted by the MCU starting with the MSB, D15, and ending with the LSB, D0 (refer to Table 2, page 21). Each incoming command message on the SI terminal can be interpreted using the following bit assignments: the first twelve LSBs, D11:D0, control each of the twelve outputs; the next three bits, D14:D12, determine the command mode; and the MSB, D15, is the watchdog bit. Multiple messages can be transmitted in succession to accommodate those applications where daisy chaining is desirable or to confirm transmitted data, as long as the messages are all multiples of 16 bits. Any attempt made to latch in a message that is not 16 bits will be ignored. The 33888 has six registers that are used to configure the device and control the state of the four high-side and eight low-side outputs (Table 3, page 21). The registers are addressed via D14:D12 of the incoming SPI word (Table 2, page 21). CSB SI SCLK D15 D1 D2 D3 D4 D5 D6 D7 D8 D9 D14 D13 D12 D11 D10 OD12 D0 OD13 OD14 OD15 OD6 OD7 OD8 OD9 OD10 OD11 OD1 OD2 OD3 OD4 OD5 OD0 SO 1. RST is in a logic [1] state during the above operation. 2. D15:D0 relate to the most recent ordered entry of program data into the 33888. 3. OD15:OD0 relate to the first 16 bits of ordered fault and status data out of the 33888. Notes CS CSB SI SCLK D15 D1* D2* D13* D14* D15* D0 D1 D14 D13 D2 D0* OD13 OD14 OD15 D14 D15 OD0 OD1 OD2 D1 D2 D13 D0 SO 1. RST is a logic [1] state during the above operation. 2. D15:D0 relate to the most recent ordered entry of program data into the 33888. 3. D15*:D0* relate to the first 16 bits of ordered entry data out of the 33888. Notes 4. OD15:OD0 relate to the first 16 bits of ordered fault and status data out of the 33888. CS Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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