Ten millimetres square and thirty-seven usable pins

The M in this part number is doing more work than it looks. It selects the PLQP0064KB-A package, sixty-four leads on a ten millimetre body at half-millimetre pitch, and that single letter turns a straightforward read into a mechanical problem. Thirty-seven of those leads are general-purpose I/O and nine more are input-only, which is a fraction of what the same die offers in a hundred-pin body. Extract R5F562TAADFM#V1 therefore starts with a question that has nothing to do with flash: how do you get a clock, a supply, a reset and a serial line onto a footprint that small without shorting two adjacent leads with a probe tip?

The order that works: power, clock, then the bus

Bring the rails up first, in the sequence the data sheet specifies, and confirm them at the decoupling capacitors rather than at the connector. This is a five-volt part, with an analog supply that can run at the same level, so a bench supply set to 5.0 volts is the correct starting point and 3.3 volts will simply not boot it. Next establish the clock. The device has an on-chip oscillator, but the serial programming path expects a defined frequency, so an external clock on the specified pin is the reliable choice. Only then does the programming interface become interesting.

Two of the sixty-four leads are shared between the serial programming function and ordinary port pins, which is the detail that catches people out. On a board that has already been designed, those pins may be loaded by the application circuit, and a pull-down intended for a sensor can look like a permanent start bit.

Extract R5F562TAADFM#V1 without lifting the part

In-circuit work is possible and usually preferable. The part stays on the board, the fixture contacts the programming pair plus reset, and the read proceeds while the rest of the circuit is held in a benign state. The trick is to keep the application from driving the shared pins during the transaction, which in practice means holding the reset line at the level that tri-states the ports, or removing the supply from any device that shares the bus. When the board cannot be isolated that way, the alternative is a socketed adapter: reflow the part onto a carrier, read it there, and reball nothing because the package has leads rather than balls.

What the CAN pins do during all this

This variant carries the CAN module, and the controller’s two pins are multiplexed with port functions that the programming tool may want. A transceiver left powered will hold the bus dominant or recessive depending on its idle state, and either condition can bias a shared line at exactly the moment the tool samples it. The simplest defence is to remove power from the transceiver, not from the microcontroller, and to confirm with a scope that the programming pair idles at the level the protocol expects before any byte is sent.

The image that comes back

Two hundred and fifty-six Kbytes of code flash, thirty-two of data flash, sixteen of SRAM: the array sizes are fixed by the letter A in third position, not by the package. The read returns the code in the order the addresses run, with the vector table at the bottom and the ID block at 0xFFFFFFA0 near the top. Deliver it as a raw binary plus an Intel HEX with correct extended-address records, and include a checksum over the whole range so the customer can prove the file matches the device without repeating the job. Where the extracted material is destined for a production line rather than an archive, the workflow in microcontroller extraction covers the hand-off, and the R5F1007A program dump write-up shows the same read pattern on an unrelated Renesas core for comparison.

Ten millimetres of silicon and the V1 suffix

The suffix after the hash is an ordering detail and it does not change what is on the die, so a plan written for one suffix works for the other. What does change the plan is the body: ten millimetres square leaves almost no annulus for a spring probe to land on, and the usual outcome of trying is a bridged pair of leads and a dead port driver. Build the adapter, reflow the part onto it, read it there. When the board must stay intact, a machined block keyed to the package corners is the only reliable alternative.

Five-volt operation with CAN fitted also means the analog rail can be run at the same potential as the core, which simplifies the supply but not the isolation: the transceiver still has to be unpowered, because its dominant state is a defined voltage on a pin the programmer may be sampling. Set the identifier question aside until after the read; the value at 0xFFFFFFA0 is data, not a prerequisite. Comparable small-body work appears in the R5F100CD write-up, the fixture philosophy is set out under microcontroller recovery, and a tighter package still is described in the reading R5F1008D hex note. Boards that reach the bench in quantity are usually triaged with the R5F100AA method first.