NRND — still available, but plan the next spin
For existing production runs it remains a viable BOM line — we source it through independent distribution and quote it to order.
52 I/O and a full peripheral set
With 52 general-purpose I/O lines and an internal oscillator, this MCU can handle a moderate-sized control panel without external clock components. The brown-out detect and watchdog timer are useful for unattended equipment that needs to recover from a glitch without a technician visit. The 32 KB RAM is enough for a modest data buffer or a small RTOS heap, but if your application logs large traces you will want to budget external SRAM or use the SPI to stream to a serial Flash.