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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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56F8346 датащи(PDF) 39 Page - Freescale Semiconductor, Inc |
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56F8346 датащи(HTML) 39 Page - Freescale Semiconductor, Inc |
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39 / 178 page  Signal Pins 56F8346 Technical Data, Rev. 15 Freescale Semiconductor 39 Preliminary EXTBOOT 112 Schmitt Input Input, pull-up enabled External Boot — This input is tied to VDD to force the device to boot from off-chip memory (assuming that the on-chip Flash memory is not in a secure state). Otherwise, it is tied to ground. For details, see Table 4-4. Note: When this pin is tied low, the customer boot software should disable the internal pull-up resistor by setting the XBOOT bit of the SIM_PUDR; see Part 6.5.6. EMI_MODE 143 Schmitt Input Input, pull-up enabled External Memory Mode — The EMI_MODE input is internally tied low (to VSS). This device will boot from internal flash memory under normal operation. This function is also affected by EXTBOOT and the Flash security mode. For details, see Table 4-4. If a 20-bit address bus is not desired, then this pin is tied to ground. Note: When this pin is tied low, the customer boot software should disable the internal pull-up resistor by setting the EMI_MODE bit of the SIM_PUDR; see Part 6.5.6. Table 2-2 Signal and Package Information for the 144 Pin LQFP Signal Name Pin No. Type State During Reset Signal Description |
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