Like all Motorola processors that share lineage from the 6800, they use the von Neumann architecture as well as memory-mapped I/O. This family has five CPU registers that are not part of the memory: an 8-bit accumulator A, an 8-bit index register X, an 8-bit stack pointer SP with two most significant bits hardwired to 1, a 13-bit program counter PC, and an 8-bit condition code register CCR.
Among the HC05's there are several processor families, each targeted to different embedded applications.
The 68HC05 family broke ground with the introduction of the EEPROM-based MC68HC805C4 and MC68HC805B6 variants in the late 1980s. Using a serial bootloader, they could be programmed in-circuit with simple software running on a PC and a low current 19 V supply (no programmer required).
The HC05 series is now considered legacy and is replaced by the HC(S)08 MCU series.
|MC6805xx||Motorola's first microcontroller family, implemented in HMOS.|
|MC68705xx||MC6805 parts with EPROM instead of masked ROM.|
|MC146805xx||MC6805 parts implemented in CMOS.|
|MC1468705xx||MC146805 parts with EPROM instead of masked ROM.|
|MC68HC05xx||MC6805 parts implemented in high-speed CMOS.|
|MC68HC805xx||MC68HC05 parts with EEPROM.|