SRAM/NOR-Flash chip-select control register 4
| EN | Memory bank enable |
| ADMUXEN | Address and data multiplexing enable |
| DEV | Memory device type |
| EXTMDBW | External memory data bus width |
| NOREN | Nor flash access enable |
| SYNCBEN | Synchronous burst enable |
| NWPOL | NWAIT polarity |
| WRAPEN | Wrapped enable |
| NWTCFG | Wait timing configuration |
| WEN | Write enable |
| NWSEN | NWAIT in synchronous transfer enable |
| RWTD | Read-write timing different |
| NWASEN | NWAIT in asynchronous transfer enable |
| CRPGS | CRAM page size |
| MWMC | Memory write mode control |