Package suffixes in the RX24T line look interchangeable and are not. R5F524TAADFF is the 80-pin LQFP with 0.65 mm pitch – package code PLQP0080JA-A – while the FN suffix in the same position is an 80-pin LFQFP at 0.50 mm. Same die, same 256 KB array, same 16 KB of RAM, different lead frame and a different set of probing constraints.
Why Pitch Decides The Method
A 0.65 mm pitch package gives about a third more space between leads than the 0.50 mm part. That is enough to land a probe on a pin without bridging, which means an in-place read is often possible on a populated board even when the programming pads are coated. On the finer pitch part the same board needs a different approach: a pogo fixture, a removal, or a local decap.
Knowing which package is on the board before quoting is the difference between a straightforward job and a return.
The Array
Code occupies FFFC0000h to FFFFFFFFh, in 2 KB blocks. E2 data flash is eight kilobytes, addressed and erased separately with a one-million-cycle rating and background operation. The option bytes and the ID code structure at FFFFFFA0h complete the set. RAM is sixteen kilobytes, which on an 80-pin body is usually split between a control loop, a communication buffer and a small diagnostic area.
What The Lock Does And Does Not Do
The ID code gates boot-mode SCI and the emulator. ROM code protection is a 32-bit value in block 0 that disables reading and rewriting through a parallel programmer when zero, and reading only when one. Start-up program protection and area protection govern self-programming. None of them removes data, and the read route used here does not depend on any of them being cleared.
Reading And Verifying
ROM block by block, E2 separately, options and ID code last. Each pass is duplicated; a block that disagrees with its duplicate is re-read. The merged HEX is written at true addresses so a blank part can take it without relocation.
What A Rebuild Team Needs Beyond The Hex
Three things, in order of usefulness: the clock tree configuration, the PWM and ADC trigger configuration, and the ID code policy. The first two decide whether the drive behaves; the third decides whether the replacement part will accept a boot-mode connection on the production line. All three are in the report.
Probing An 80-Pin Board
A 0.65 mm pitch package sits at the edge of what a hand probe can reach reliably. The approach that works is a short flying lead soldered to a test pad rather than a needle on the pin, and even then the lead length has to stay under a few centimetres or the serial timing degrades. Where the board provides a programming header, that header is always the first choice.
Boards that were programmed in-circuit often keep the header populated. Boards that were programmed before assembly usually do not, and the pads may be tented. Both cases are visible in a photograph, which is why the intake form asks for one.
Where The E2 Area Earns Its Keep
Eight kilobytes of E2 data flash on a motor controller is rarely a log. It is a parameter store: current limits, ramp times, encoder offsets, and a serial number written at end of line. Losing it means the replacement runs with defaults, and defaults on a drive are conservative rather than correct.
That is why the E2 area is read on its own pass and delivered as its own binary. A customer who restores the code but not the parameters ends up with a unit that powers up, refuses to spin, and looks like a failed extraction.
Intake
Send the board with a note on the package marking if it is legible, since FF and FN are easy to confuse at a glance. Note the DC bus voltage and whether the design uses an encoder or sensorless control.
Quotes: services page. Questions: contact form. The fine-pitch sibling is R5F524TAADFN, and the 32 KB RAM version is R5F524TBADFP.