Why is ds1302 in 51 microcontrollers, when used, why should the read minute and second display data

Because you have an error generated ::Hardware?

Procedure?

What do you use to display it? If it is 1602, it needs to be converted to ASCII code to display.

The DS1302 stores data in hexadecimal and should be converted to decimal before you display it.

How to solve it, share it.

Check the crystal oscillator, I2C driver**, chip manual to see the read and write order, note the decimal and 24 conversions, and the display section. If it's OK and there is still a problem, either the chip is broken, or it is a very elementary problem, find someone who knows how to help you adjust it.

Can't take it out of context, you should look at it in its entirety, and read a ** that you have completed yourself:

for(i=0; i<8; i++)

coutdata >>1;

if(sda_1302 ==1)

coutdata |=0x80;

clk_1302 = 1;

nop_()

clk_1302 = 0;

nop_()

The chip began to output a low bit, and after reading 8 positive shots and delays, the right He Qi shifted 8 times, and it had to be the output bytes.

Because the data of 1302 is serial.

That's determined by the characteristics of the chip, just refer to the data sheet.

There are good programs to go to the China Electronics Development Network ( to go and bask in the sun I've been diving there.

I've been working on this program lately, so I've just taken a look at your program, and you're reading out the data from the ds1302 and sending it straight to the display, like this.

write_datae(shu[read_ds(0x89)/10]);

write_datae(shu[read_ds(0x89)%10]);

I'm used to writing programs like this, and it's good, but it's a little complicated, but it works great.

Can I tell you how to do it before, and how to do it now, so that the display speed is nearly ten times faster?

When I used to make a temperature acquisition system, the display sometimes messed up, and I haven't found the reason yet, you have changed a lot of programs, but there may be some modules that have not been changed, pay attention to these modules, or just pay attention to the variables, especially the variables that are available in the interrupt and the main program.

You first try to see if the display program of the direct digital tube is normal, that is, to directly assign the value to the digital tube to test.

Then you use the tested digital tube to see what the data reads out, and the data directly read out by DS1302 looks like this. For example, if it reads 22, it should be 16 seconds.

Why is this so? The conversion of decimal 22 to hexadecimal is 0x16, which is how DS1302 is expressed.

For example, 0x59 is 59 So after you read out the data, you need to convert the hexadecimal 0x59 to 59 in decimal to display it correctly. As for how to convert, think for yourself.

The connection between DS1302 and the single-chip microcomputer must be short, not higher than 5 cm, if you take the Dupont wire, it is very likely that there will be a problem, I have been in this pit before.