SunFounder ESP32 Starter Kit
Working Principle
When MR (pin10) is high level and OE (pin13) is low level, data is input in the rising edge of SHcp and goes to the
memory register through the rising edge of STcp.
• Shift Register
– Suppose, we want to input the binary data 1110 1110 into the shift register of the 74hc595.
– The data is input from bit 0 of the shift register.
– Whenever the shift register clock is a rising edge, the bits in the shift register are shifted one step. For
example, bit 7 accepts the previous value in bit 6, bit 6 gets the value of bit 5, etc.
5.8. 74HC595 703
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