The R5F100FF is the 96 KB member of the 44-pin LQFP row, the first in the
row to carry the 8 KB data flash that begins at this capacity, with 8 KB of
RAM and ten converter channels in the 10 by 10 mm 0.8 mm-pitch package. It
combines the family’s most workable package with the large-memory
configuration, and it is the capacity at which logging-heavy firmware and
field updates are the designed-in mode of operation rather than an
accommodation.

The 8 KB data flash in the most readable package

From 96 KB upward the separate data array is 8 KB, and on this member the
doubling is directly observable through 0.8 mm leads: the array is read
with the data-flash command set, its protection flags are separate from the
code side, and its wear-levelled records hold the fault histories and
calibration generations that smaller members could not afford. For a
recovery job the array is the unit’s biography, and capturing it is not
optional.

Ninety-six blocks and the update zone

Ninety-six kilobytes is ninety-six erase blocks, and the update
machinery at this capacity is sized like the application around it: a
boot region in the lowest four blocks, its mirror from 02000H, and a
flag in the first block that names the live copy. Field-updated
products keep both copies written, and the older one usually still
holds the firmware the unit left the factory with. A capture that
walks the whole array picks up both generations for free, and the
diff between them is the most honest changelog the product will ever
have.

Eight KB of RAM and the library

Eight kilobytes of volatile memory carry the flash library, the update
protocol and the application’s buffers together, and the reservation
the library carves at the top of the space marks an update-capable
image in any recovered linker map. On the readout side the same
arithmetic applies: a walker resident below the reservation streams
the array while the sequencer works, and a marginal fixture contact
costs one failed kilobyte rather than a corrupt whole.

Protection at this capacity

The first kilobyte carries the whole security posture: four option
bytes for watchdog, detector and oscillator policy, the fourth doubling
as the debug gate with its wipe-on-failure choice, and the two ten-byte
identifiers for the emulator and the TOOL0 programmer. The boot-area
guard ships enabled and matters here because the swap feature is in
daily use. Captured as found, the block lets a repaired image go back
with the posture it was born with, shield window included where
firmware confines its own updates.

Access and the bench

Nothing on this package slows the bench: 0.8 mm leads take a fixture
directly, adapters are ordinary work, and a lifted part returns to the
board without ceremony. When the obstacle is the image rather than the
package, the IC decapsulation service route is there; the streaming workflow is on
the firmware extraction service page and examination-level handling is the chip reverse engineering service flow.

Row context

The 44-pin siblings are in R5F100FA memory readout through R5F100FE program memory and
R5F100FG memory dump to R5F100FL firmware decryption. The 96 KB die in other packages is the
30-pin R5F100AF memory readout, the 32-pin R5F100BF memory dump, the 36-ball
R5F100CF locked flash and the 40-pin R5F100EF flash memory. For the data-flash boundary
from the 36-ball row’s perspective, see R5F100CF locked flash, and the family
service entry is the MCU crack service page.

Reading the doubled log correctly

The 8 KB data store is organised for wear levelling, and its records
only make sense with the allocation map that heads the array. Reading
the map first, then the records in map order, turns a flat dump of
seemingly contradictory values into a coherent history: current
calibration, superseded revisions, running totals that were retired at
boundaries. Captures that skip the map are recoverable, the ordering
can be reconstructed, but it doubles the analysis time. The array’s own
protection flags and the session’s command usage are recorded alongside
so the dump can be replayed exactly.

Wear levelling makes the array’s physical order differ from its logical one, and the map that reconciles them lives near the front of the store. Reading the map first is the difference between an archive and a pile of numbers, and it costs one extra command in the same session. The 8 KB scale also means partial histories survive: even a unit whose log was cleared keeps retired records around the boundaries, and those retired records have settled more than one argument about how a board was actually used.