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HC705E5GRS/D Datasheet(PDF) 99 Page - NXP Semiconductors |
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HC705E5GRS/D Datasheet(HTML) 99 Page - NXP Semiconductors |
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99 / 148 page ![]() Synchronous Serial Interface (SSI) SSI Signals MC68HC705E5 — Rev. 1.0 General Release Specification Synchronous Serial Interface (SSI) pin will depend on the value of the CPOL bit. Data can be sent or received in either MSB first format (LSBF = 0) or LSB first format (LSBF = 1). If (CPOL = 1), the first falling edge of SCK will shift the first data bit out to the SDIO pin. Subsequent falling edges of SCK will shift the remaining data bits out. If (CPOL = 0), the first data bit will be driven out to the SDIO pin before the first rising edge of SCK. Subsequent falling edges of SCK will shift the remaining data bits out. SDIO as an Input Pin The SDIO pin will accept data once the SSI is enabled and the SDIR bit = 0. Valid data must be present at least 100 ns before the rising edge of the clock and remain valid for 100 ns after the edge. See Figure 12-2 and Figure 12-3. Figure 12-2. Synchronous Serial Interface Timing (CPOL = 1) Figure 12-3. Synchronous Serial Interface Timing (CPOL = 0) SDIO BIT 1 BIT 2 BIT 3 BIT 7 SCK BIT 8 SE SDIO BIT 1 BIT 2 BIT 3 BIT 7 SCK BIT 8 SE Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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