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CY14B256P-SFXIT Datasheet(PDF) 7 Page - Cypress Semiconductor |
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CY14B256P-SFXIT Datasheet(HTML) 7 Page - Cypress Semiconductor |
7 / 36 page CY14B256P Document Number: 001-53881 Rev. *E Page 7 of 36 SPI Modes CY14B256P device may be driven by a microcontroller with its SPI peripheral running in either of these two modes: ■ SPI Mode 0 (CPOL=0, CPHA=0) ■ SPI Mode 3 (CPOL=1, CPHA=1) For both these modes, the input data is latched in on the rising edge of SCK starting from the first rising edge after CS goes active. If the clock starts from a HIGH state (in mode 3), the first rising edge after the clock toggles is considered. The output data is available on the falling edge of SCK. The two SPI modes are shown in Figure 4 and Figure 5. The status of clock when the bus master is in standby mode and not transferring data is: ■ SCK remains at 0 for Mode 0 ■ SCK remains at 1 for Mode 3 CPOL and CPHA bits must be set in the SPI controller for the either Mode 0 or Mode 3. CY14B256P detects the SPI mode from the status of SCK pin when the device is selected by bringing the CS pin LOW. If SCK pin is LOW when the device is selected, SPI Mode 0 is assumed and if SCK pin is HIGH, CY14B256P works in SPI Mode 3. Figure 3. System Configuration using SPI nvSRAM P 6 5 2 B 4 1 Y C P 6 5 2 B 4 1 Y C uC o ntrolle r SC K MO S I MIS O SI SO O S I S K C SS C K CS HO L D HO L D CS CS 1 CS 2 HO L D 1 HO L D 2 Figure 4. SPI Mode 0 LSB MSB 7 654 32 10 CS SCK SI 0 1 2 3 4 5 6 7 Figure 5. SPI Mode 3 CS SCK SI 7 654 32 10 LSB MSB 0 12 3 4 56 7 [+] Feedback |
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