R5F100EE brings 64 KB of code flash and 4 KB of RAM to the 40-pin HWQFN,
with the 4 KB data flash of the small-memory row and the nine-channel
converter that marks the 40-pin class. It is the capacity where the
self-programming library runs from volatile memory with room to spare, the
boot swap machinery comes into routine use, and the package is large enough
that access is rarely the hard part of the job.

The FEF00H window with room to work

Four kilobytes of volatile memory map from FEF00H, and the flash library
reserves its workspace from the top of that range on exactly these
parts. An image built for updates shows the reservation; a readout
loader claims the same region, because during erase and write the
sequencer stops serving code fetch and anything that must keep running
has to be in RAM. On this member there is room for the loader and the
application’s state at once.

Sixty-four blocks and both generations

Sixty-four erase blocks carry the program, four at the bottom forming
the boot region and four more its mirror from 02000H, each copy holding
its own security bytes at 010C0H and 010C4H. The flag in the first block
names the live one, and on maintained boards the retired copy keeps the
generation the product was born with. Reading both is standard practice
here, and the diff between them is the field record.

Nine channels and the data array

The converter’s nine inputs feed the control loop, and their calibration
lives in the 4 KB data flash alongside the wear-levelled logs. The array is
read with the data-flash command set and captured with its protection flags
noted. A controller cloned from code alone lacks the calibration to regulate
like the original, which is why the data side is never skipped on this
member regardless of how urgent the job is. The session order is fixed
for the same reason: security bytes first, code blocks with per-block
checksums, then the array with its flags, so two captures taken months
apart can be compared line for line.

Protection posture

Boot-area guard, debug gate, erase-on-failure bit, two ten-byte
identifiers: the entire posture is configured from the first kilobyte,
and none of it gates a read. That block is captured passively before
anything connects, and it answers every question the first connection
would otherwise ask for free.

Access on the 40-pin QFN

The 6 by 6 mm body and 0.5 mm pitch give a fixture more clearance than the
smaller QFN rows, and production layouts usually route the single-wire
TOOL0 pad to a test point. Where they do not, lift-and-reball onto an
adapter is routine and reversible. The die is reachable through the
IC decapsulation service service as the last resort, and the imaging flow is on the
firmware extraction service page.

Row context

The 40-pin row steps up from R5F100EF flash memory to R5F100EH firmware decryption and begins
at R5F100EA program memory. The same 64 KB die is available as the 20-pin
R5F1006E firmware decryption, the 24-pin R5F1007E flash heximal, the 30-pin R5F100AE firmware decryption,
the 32-pin R5F100BE embedded memory, the 36-ball R5F100CE memory readout and the 44-pin
R5F100FE program memory. The boot-swap mechanism has its own note under
R5F100FE boot cluster recovery, and the family entry is MCU crack service.

Two arrays, one session

The code store at 64 KB divides into sixty-four erase blocks with the
boot region and its mirror at the bottom, and the 4 KB data store has its
own block structure beside it. One disciplined session reads both: code
through the code-side commands, data through the data-side set, and the
security bytes passively at the start. Mixing the two command sets
carelessly is a known way to corrupt a data array that was otherwise
intact, so the walker keeps the sessions explicit and the flags recorded
separately. The result is a capture that supports both a rebuild and an
analysis, rather than only the first. Session order is fixed: passive
security bytes, code blocks with per-block checksums, data array
with its flags, boot flag raw. The fixed order is what makes two
sessions on the same board comparable, which matters when the
first capture was taken months before the repair that finally
needs it.