Motorola 68HC12

The first 68HC12 derivatives had a maximum bus speed of 8 MHz and flash memory sizes up to 128 KB.

[1] Beginning in 2000 the family was extended with the introduction of the MC9S12 derivatives which have bus speeds of up to 25 MHz and flash sizes up to 512 KB.

The MC9S12NE64 was introduced by Freescale in September 2004, claiming to be the "industry's first single-chip fast-Ethernet Flash microcontroller."

The MC9S12XDP512 which was introduced in 2004 has a bus speed of 40 MHz and a peripheral co-processor known as the XGATE which allows for some tasks to be offloaded from the CPU.

Freescale announced the MC9S12XEP100 in May 2006 to further extend the S12X family to 50 MHz bus speed and add a Memory protection unit (based on segmentation) and a hardware scheme to provide emulated EEPROM.