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MAX17841B 数据表(PDF) 21 Page - Maxim Integrated Products |
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MAX17841B 数据表(HTML) 21 Page - Maxim Integrated Products |
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21 / 33 page  Table 11. Transaction Sequence for UART Write and Read SPI DIN SPI DOUT DESCRIPTION TRANSACTION 1 LoadtheWRITEALLcommandsequenceintotheloadqueue C0h xxh WR_LD_QSPIcommandbyte 06h xxh Message length = 6 02h xxh WRITEALLcommandbyte 12h xxh Register address of the device B1h xxh LSbyteofregisterdatatobewritten B2h xxh MS byte of register data to be written C4h xxh PECbytefor02h,12h,B1h,B2h 00h xxh Alive-counter byte (seed value = 0) TRANSACTION 2 StarttransmittingtheWRITEALLsequencefromthetransmitqueue B0h xxh WR_NXT_LD_QSPIcommandbyte TRANSACTION 3 Checkifamessagehasbeenreceivedintothereceivebuffer 01h xxh ReadRX_Statusregister xxh 12h IfRX_Status[1]istrue,continue.Otherwise,repeatuntiltrueortimeout. TRANSACTION 4 ReadreceivebuffertoverifythesentWRITEALLmessage 93h xxh RD_NXT_MSGSPI xxh 02h Sentcommandbyte(WRITEALL) xxh 12h Sent address xxh B1h SentLSbyte xxh B2h Sent MS byte xxh C4h SentPEC xxh 02h Alive-counterbyte(=sentseed+2,ifalivecounterenabled) TRANSACTION 5 Checkforreceivebuffererrors 09h xxh ReadRX_Interrupt_Flagsregister xxh 00h Ifnoerrors,continue.Otherwise,clearandgotoerrorroutine. TRANSACTION 6 LoadtheREADALLcommandsequenceintotheloadqueue C0h xxh WR_NXT_LD_QSPIcommandbyte 09h xxh Messagelength(5+2xn=9) 03h xxh READALLcommandbyte 12h xxh Register address 00h xxh Data-checkbyte(seedvalue=00h) CBh xxh PECbyteforbytes03h,12h,00h 00h xxh Alive-counter byte (seed value = 00h) TRANSACTION 7 StarttransmittingtheREADALLsequence B0h xxh WR_NXT_LD_QSPIcommandbyte TRANSACTION 8 Checkifamessagehasbeenreceivedintothereceivebuffer 01h xxh ReadtheRX_Statusregister xxh 12h IfRX_Status[1]istrue,continue.Otherwise,repeatuntiltrueortimeout. Maxim Integrated │ 21 MAX17841B Automotive SPI Communication Interface (ASCI) www.maximintegrated.com |
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