Philips 68070

• Operation from 4 - 17.5 MHz
• Inclusion of a minimal, segmented MMU supporting up to 16 MB of memory
• Built-in DMA controller
• I²C bus controller
• UART
• 16-bit counter/timer unit
• 2 match/count/capture registers allowing the implementation of a pulse generator, event counter or reference timer
• Clock generator

• Instruction execution timing is completely different
• Interrupt handling has been simplified
• The SCC68070 has MC68010 style bus-error recovery. They are not compatible, so exception error processing is different.
• The SCC68070 lacks a dedicated address generation unit, so operations requiring address calculation run slower due to contention with the shared ALU. This means that most instructions take more cycles to execute, for some instructions significantly more, than a 68000.
• The MMU is not compatible with the Motorola 68451 or any other "standard" Motorola MMU, so operating system code dealing with memory protection and address translation is not generally portable. Enabling the MMU also cost a wait state on each memory access.