| CLR | CSMSB | CSLSB | WR | LDAC | FUNCTION |
| L | × | × | X | X | Clears input and DAC registers to zero |
| H | × | × | X | L | Loads DAC register with contents of input registers |
| H | × | × | X | H | Freezes contents of DAC register |
| H | L | H | L | X | Writes MSB byte into MSB input register |
| H | H | L | L | X | Writes LSB byte into LSB input register |
| H | L | L | L | X | Writes MSB and LSB bytes into MSB and LSB input registers |
| H | X | X | H | × | Inhibits write to MSB and LSB input registers |
| H | H | X | X | X | Inhibits write to MSB input register |
| H | × | H | X | × | Inhibits write to LSB input register |
| H | L | L | L | L | Data bus flows directly through input and DAC registers |
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