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1745D–ATARM–04-Nov-05
AT91M55800A
• ARCH: Chip Architecture
Code of Architecture: Two BCD digits
• NVPTYP: Nonvolatile Program Memory Type
Note: All other codes are reserved.
• EXT: Extension Flag (Code Label SF_EXT)
0 = Chip ID has a single-register definition without extensions
1 = An extended Chip ID exists (to be defined in the future).
17.2.2 Chip ID Extension Register
Register Name: SF_EXID
Access Type: Read-only
Offset: 0x04
This register is reserved for future use. It will be defined when needed.
ARCH Selected ARCH Code Label: SF_ARCH
0110 0011 AT91x63yyy SF_ARCH_AT91x63
0100 0000 AT91x40yyy SF_ARCH_AT91x40
0101 0101 AT91x55yyy SF_ARCH_AT91x55
NVPTYP Type Code Label: SF_NVPTYP
0 0 1 “M” Series or “F” Series SF_NVPTYP_M
1 0 0 “R” Series SF_NVPTYP_R