74HC574 application circuit schematic (used as register)

74HC574 Application Circuit Schematic Diagram

Register is an important digital circuit component, often used to temporarily store data, instructions, etc. A flip-flop can store one bit of binary code, and to store N bits of binary code, N flip-flops are enough. Because our model machine is 8-bit, most registers in this model machine are 8-bit, and the flag register (Cy, Z) is 2-bit.
In the COP2000 experimental instrument, the register is composed of 74HC574, which can store 8-bit binary code, and one bit of binary code is stored by a D flip-flop. First, let's introduce the working principle of 74HC574. Figure 2-1 is the schematic diagram of 74HC574.

  Figure 2-1 Schematic diagram of 74HC574          We can see that at the rising edge of CLK, the data at the input end is entered into the 8 flip-flops. When OC = 1, the output of the flip-flop is turned off, and when OC = 0, the flip-flop outputs data.     Table 2-1 lists the usage of 74HC574.                           Table 2-1 74HC574 usage