http://www.ti.com/lit/ds/symlink/sn74hc595.pdfI'm trying to understand how to use the 74HC595 and I think I understand what I need to do. Here is my understanding, please correct me if I'm wrong...
To shift a bit into the shift register:
1. Pull OE low.
2. Wait for a falling edge on SRCLK.
3. Set SER to the desired bit value.
4. Wait for the next falling edge on SRCLK.
5. Set RCLK high, and hold until a rising edge on SRCLK.
Does SRCLK have to run continuously if I'm not using the chip? Or can I start pulsing SRCLK only when I need to use the chip. Will stopping SRCLK clear the current output?
Also, I'm not sure I understand how to read section 7.6 Timing Requirements.
What are do the different parameters represent?
tpd - ?
tPHL - ?
tt - ?
Thanks,
Dave