R5F100GE is the entry point of the 48-pin row, carrying 64 KB of code flash,
4 KB of RAM and the family’s 4 KB data flash into a 7 by 7 mm LFQFP on a
0.5 mm pitch. Ten converter inputs and forty-four general-purpose lines give
the package the sensor-and-actuator spread that mid-size industrial and
appliance boards are laid out around, and the 64 KB program store is large
enough that field updates are normal rather than exceptional. In the catalogue
this member is the reference point for the whole row: the same die appears in
every smaller package at identical memory, and everything else on the 48-pin
list is a capacity change, not an architectural one.

Why the 48-pin body is the easy case

Compared with the wafer-level and QFN members, a leaded LFQFP is cooperative.
Each lead stays exposed after reflow, the 0.5 mm spacing is within reach of a
pitched fixture, and the signals that matter to a readout, the single-wire pad
on P40, the UART pair on P11 and P12, the regulator capacitor pin, are usually
routed to test points on a board that was ever serviced in production. When
the layout offers nothing, the part lifts with hot air and re-balls onto an
adapter with no special risk; the body is large enough to handle and the leads
survive a careful reflow. Most jobs on this member never go near the physical
layer at all.

The floor plan a 64 KB image implies

Sixty-four kilobytes is sixty-four erase blocks of one kilobyte. The bottom
four form the first boot region and the four starting at 02000H wait as the
swap target for designs that update in the field. When the swap feature is
active the security configuration exists twice, once per copy, at 010C0H and
010C4H, and a flag byte in the first block says which copy the reset logic
trusts. A dump captured without the flag is ambiguous about which half of the
image was live, and a dump captured without the inactive copy throws away the
firmware generation the product was born with.

How the image reads itself out

Erase and write are sequencer operations that stop the CPU from fetching code,
so anything that must keep running while the array is busy sits in volatile
memory. The 4 KB RAM maps from FEF00H, and the flash library carves its
workspace from the top of that range; a linker map that reserves exactly that
window is the signature of an image built for self-programming. The same
arithmetic works in reverse for a readout: a streaming loader resident below
the window can walk all sixty-four blocks and the data array while the
application waits, and the four-byte programming word governs how any repair
is written back afterward.

The security bytes and their two states

Four configuration bytes at the very bottom of the array set watchdog,
detector and oscillator behaviour, and the fourth also decides whether the
debug interface answers and whether a failed identifier comparison wipes the
array. Two independent ten-byte identifiers follow: one gates the emulator,
the other gates the serial programmer on TOOL0. Production boards arrive in
one of two states. Either both identifiers are blank, which leaves the chip
wide open, or one was written and the other forgotten, the more common
half-closed case, and which of the two applies decides the entire approach.
Reading the identifier area passively, before any tool connects, is therefore
the first physical act of every job on this member.

What a complete capture contains

Four artifacts: the full code array with both boot copies, the 4 KB data array
with its calibration and wear records, the security bytes exactly as found,
and the boot flag. The data side matters as much as the code here. Appliance
and industrial firmware keep their scaling factors, fault histories and
service counters in it, and a rebuilt controller without those values boots
cleanly and regulates wrongly. Verification runs per block, so a marginal
probe on one lead produces one failed kilobyte rather than a silently corrupt
capture.

Choosing the route in

The decision tree on this part is short. If the serial identifier is blank,
the boot ROM itself streams the array out over TOOL0 with no invasive step.
If it is populated but the debug identifier is not, an emulator with the right
adapter opens the image. If both are set, the work moves to reconstructing the
identifier bytes from context or, failing that, to the package level. The
imaging stage is described on the firmware extraction service page, and when silicon rather than
wiring is the obstacle, the IC decapsulation service route applies.

Row and family context

Within the 48-pin row the smaller members begin at R5F100GA memory readout, and the
next capacity up is R5F100GF embedded memory. The same 64 KB die appears across the
line in the 20-pin R5F1006E firmware decryption, the 40-pin R5F100EE flash data and the 44-pin
R5F100FE program memory, the closest comparisons for planning a capture in another
package. The boot-swap mechanism that dominates the update story has its own
treatment under R5F100FE boot cluster recovery, and an index of the family-level
services is kept on microcontroller unlock.