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AT89C5122D-RDRUM 数据表(PDF) 90 Page - ATMEL Corporation |
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AT89C5122D-RDRUM 数据表(HTML) 90 Page - ATMEL Corporation |
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90 / 208 page  90 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 Procedure for CVcc = 5volts The DC/DC pump mode must be selected (MODE = 0 in DCCKPS register). The detailed procedure is described in flow chart of Figure 47. Figure 47. Card Vcc = 5V Initialization Procedure While VCC remains higher than 4.0V and startup current lower than 30 mA (depending on the load type), the DC/DC converter should be ready without having to increment BOOST[1:0] bits beyond [0:0] level. If VCC > 4.0V and startup current > 30 mA, it will be necessary to increment the BOOST[1:0] bits until the DC/DC converter is ready. Incrementation of BOOST[1:0] bits increases at the same time the current overflow level in the same proportion as the startup current. So once the DC/DC converter is ready it is SCCON CardVcc=1 VCARDOK=1 Set Timeout to 3 ms Timeout Expired Increment BOOST [1:0] BOOST[1:0] = max = 3? DC/DC Initialization Failure DC/DC Initialization Successful Decrement BOOST[1:0] to adjust the current overflow Mode Pump DCCKPS[7]=0 BOOST[1:0]=[0:0] SCICR.7=Reset=0 SCICR.7=Reset=1 VCARD[1:0] = 11 BOOST[1:0] = [0:0] |
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