This is the reset timing diagram. Let's analyze how to read the timing diagram in combination with the program.
The IN and OUT above are definitions for the SD card as the host. IN is the interface for the microcontroller to send data to the SD card, and OUT is the interface for the SD card to send data.
Timing diagram We write the program step by step based on the CLK status. The first part is: 74 clock beats, which means starting to send 74 clock beats. CS must be set high, data line IN must send 1, and OUT can be ignored. The program is as follows
SD_CS=1;
for(i=0;i<0x0f;i++)
SD_CS=0;
In this way, we have completed the first part of the timing. SD_spi_write() is the read and write function of the SPI interface that I wrote earlier. Here we sent more than 74 clock beats. Will this be a problem? We can see that there is a blank after 74 in the timing diagram, so there is no problem. The timing beats can be more but not less.
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