To clear bits in a register without changing the other bits, the I²C controller must provide an I²C command with four frames, as illustrated in Figure 7-29. The register address is the address of the register where the bits must be cleared and where the register data are the values representing the bits that must be cleared. Bits with a value of 1 in register data are cleared and bits with a value of 0 in register data are not changed. The opcode for clearing a bit is listed in Table 7-4. To end this command, the controller must provide a STOP or a RESTART condition in the I²C frame.