32
| SRAM | Readable/Writable or Read only selection bit |
| MBM | SPI data width setting bits |
| SSEL0EN | Slave select 0 enable bit |
| SSEL1EN | Slave select 1 enable bit |
| SSEL2EN | Slave select 2 enable bit |
| SSEL3EN | Slave select 3 enable bit |
| MSEL | Memory device selection bits |