of the SD card, divided into three gears: Class 2, 4, 6, corresponding to the write speed 2mb/s, 4mb/s, 6mb/s. According to the card capacity is divided into standard cards (less than 2GB) and high-capacity cards (2GB~32GB), the current application of the SD
broadcast bcr:broadcast with response responsive broadcast ac:address (point-to-point) command: Point-to-point, DATA0 No data adtc:adress (point-to-point) data Transfer Commands Point-to-point, data0~data3 data line data cmd0 on ~DATA3 cable , CMD2, CMD3, CMD55, ACMD41 commands may cause the status of the card to change response type: R1,R1B, R2, R3,R6 (SD2.0 expanded R7) extended content: SPI operating mode: To know the characteristics: only one
: Bc:broadcast without Response unresponsive broadcast bcr:broadcast with Response responsive broadcast ac:address (p Oint-to-point) Command: Point-to-point, data0~data3 data-Line no data adtc:adress (point-to-point) Transfer Commands Point-to-point, data0~ Data on the DATA3 data line
CMD0, CMD2, CMD3, CMD55, ACMD41 commands may cause the status of the card to change response type: R1,R1B, R2, R3,R6 (SD2.0 expanded R7) extended content: SPI operating
: Bc:broadcast without Response unresponsive broadcast bcr:broadcast with Response responsive broadcast ac:address (p Oint-to-point) Command: Point-to-point, data0~data3 data-Line no data adtc:adress (point-to-point) Transfer Commands Point-to-point, data0~ Data on the DATA3 data line
CMD0, CMD2, CMD3, CMD55, ACMD41 commands may cause the status of the card to change response type: R1,R1B, R2, R3,R6 (SD2.0 expanded R7) extended content: SPI operating
Capacity Class
SD capacity 8MB, 16MB, 32MB, 64MB, 128MB, 256MB, 512MB, 1GB, 2GBSDHC capacity 2GB, 4GB, 8GB, 16GB, 32GBSDXC capacity 32GB, 48GB, 64GB, 128GB, 256GB, 512GB, 1TB, 2TB
SD Card Register
command Format
All commands are in this format, with a total of 48 digits. One starting bit, One Direction bit, 6 comma
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