Function name: HC595SendData //8-bit serial input/output, parallel output
Function description: Send data to the SPI bus. Here we only explain the general situation of parallel input.
Pin description: Please refer to the relevant chip information
void HC595SendData(unsigned int SendVal)
{
unsigned char i;
for(i=0;i<8;i++)
{
if((SendVal<
Keywords：74HC595
Reference address：74HC595 uses SPI bus to connect to 51 microcontroller driver
//If the highest bit of the input is 1, then set the serial input to 1, otherwise input 0
else MOSIO=0;
S_CLK=0; //Rising edge input each bit
NOP(); //The datasheet gives the maximum rise and fall time as 1000ns
NOP(); //Here is 2us, which is enough
S_CLK=1;
}
R_CLK=0; //set dataline low
NOP(); //Output 8-bit parallel data on the rising edge
NOP(); //The explanation of delay is the same as above
R_CLK=1; //Chip select
OE=0;
}
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C51 program for microcontroller driving 74HC595
//This subroutine is for 74HC595 to send characters. This program sends the lowest bit first!
//The clock pin of chip 74HC595 is pin 11
//The data pin of chip 74HC595 is pin 14
//The latch pin of chip 74HC595 is pin 12
//When multiple 74HC595s are connected in series, the signal will be latched only
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