OCU ch.0/1 Control Register B
| OTD0 | Indicates that the RT(0) output pin is in the High-level output state. |
| OTD1 | Indicates that the RT(1) output pin is in the High-level output state. |
| CMOD | selects OCU’s operation mode in combination with OCSC.MOD0 to MOD5 |
| FM4 | selects FM4 mode for operating mode |