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DSP56362AD bảng dữ liệu(PDF) 29 Page - Motorola, Inc |
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DSP56362AD bảng dữ liệu(HTML) 29 Page - Motorola, Inc |
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29 / 168 page ![]() Signal/Connection Descriptions Serial Host Interface MOTOROLA DSP56362 Advance Information 1-21 HREQ Input or Output Tri-stated Host Request—This signal is an active low Schmitt-trigger input when configured for the master mode but an active low output when configured for the slave mode. When configured for the slave mode, HREQ is asserted to indicate that the SHI is ready for the next data word transfer and deasserted at the first clock pulse of the new data word transfer. When configured for the master mode, HREQ is an input. When asserted by the external slave device, it will trigger the start of the data word transfer by the master. After finishing the data word transfer, the master will await the next assertion of HREQ to proceed to the next transfer. This signal is tri-stated during hardware, software, personal reset, or when the HREQ1–HREQ0 bits in the HCSR are cleared. There is no need for external pull-up in this state. This input is 5 V tolerant. Table 1-10 Serial Host Interface Signals (Continued) Signal Name Signal Type State during Reset Signal Description Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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