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数据搜索系统，热门电子元器件搜索 |
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HCS320 数据表(PDF) 12 Page - Microchip Technology |
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HCS320 数据表(HTML) 12 Page - Microchip Technology |
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12 / 28 page  HCSXXX DS41256A-page 12 Preliminary 2004 Microchip Technology Inc. 2.8 Verify Mode In terms of verify operations, all KEELOQ encoders and transponders incorporate a security feature that only allows one verify operation to be completed, and it must be completed at the end of the programming sequence before exiting the Programming mode. When implementing polling routines to sense the end of the last write cycle and after driving the clock line low, the programmer can begin to read data by continuing to provide clock cycles to the target device. Note that there is not an Acknowledge bit from KEELOQ devices during the Verify mode. In the case where the programmer provides a time delay to allow for write cycle completion, the programmer can provide clock cycles after the delay to begin reading data. 3.0 CONFIGURATION WORD For detailed descriptions of bit functions for the configuration words of the KEELOQ devices, be sure to download the latest Data Sheet for the respective device from the Microchip Technology web site (www.microchip.com). Configuration word architectures are also shown earlier in Section 2.0 “Memory Mapping”. 4.0 OSCILLATOR TUNING Calibrating the oscillator of select devices can be completed a number of ways. For the purpose of this document, calibration will be completed using the Two- Point Calibration Algorithm, which is described in Application Note AN824, “KEELOQ® Encoders Oscillator Calibration” (DS00824). The algorithm is as follows: • OSCCAL = -8 • Program target device • Measure oscillator frequency FHIGH • OSCCAL = +7 • Program target device • Measure oscillator frequency FLOW • Interpolate: - OSCCAL = 16*(FIDEAL - FLOW)/(FHIGH - FLOW) • Program target device For a better understanding of how to implement this algorithm, the following flow charts are being provided: Note: Decoders do not incorporate a verify function. |
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