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AT89C5122D-RDRUM 数据表(PDF) 91 Page - ATMEL Corporation |
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AT89C5122D-RDRUM 数据表(HTML) 91 Page - ATMEL Corporation |
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91 / 208 page  91 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 advised to decrement the BOOST[1:0] bits to restore the overflow current to its normal or desired value. Monitoring Procedure Once the DC/DC has been successfuly initialized, it is necessary to monitor the DC/DC converter by means of bits VCARDOK and ICARDOVF in the SCISR register. Table 60. DC/DC converter status VCARDOK ICARDOVF DC/DC Status 00 - Not Started or switched off by application. The current overflow sensor is disabled during the DC/DC converter startup. Then if a current overflow condition is applied during the DC/DC converter startup, the DC/DC converter is unable to start and both bits VCARDOK and ICARDOVF remains at 0. DC/DC converter correctly started then the output voltage is out of ISO/IEC 7816-3 specifications. In this case the firmware must take appropriate actions like deactivating the DC/DC converter in compliance with ISO/IEC 7816. 0 1 Started and automatically switched off by a current overflow condition 1 0 Operating properly according to ISO/IEC 7816-3 and EMV recommendations 1 1 Not applicable |
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