The following is a list of SFR that are set by the DS80C400's ROM Loader before control is transferred to a user application.
This table is provided for information only. It is recommended that applications explicitly set SFR's to a default state if the application intends to use that SFR.
| SFR | Value set by loader | Comments |
| ACON (9D) | 00000110 | Enables extended stack and 24-bit contiguous mode |
| P4CNT (92) | 00101111 | 2M blocks, all chip enables on |
| P5CNT (A2) | 00000111 | Enable PCE outputs |
| P6CNT (B2) | 00100111 | Enable ~CE4 to ~CE7 |
| MCON (C6) | 10101111 | Relocate Internal and CAN RAM |
| MCON1 (D6) | 00001111 | Combined code/data for CE4 to CE7 |