The latter specifics was heavily used by the loading mechanism and so-called monitor mode.īy applying higher-than-usual voltage on IRQ pin the MCU listens to chosen pin to serial commands, allowng user to write/read memory and run the program, either from RAM or FLASH. It keeps its "as small amount of registers as possible" architecture, familiar to 6502 users too and Von-Neumann memory arrangement, meaning RAM and FLASH in the same memory area, meaning you can execute from RAM and read "variables" from FLASH. The HC08 was based on MC6805 MCU and it was based on MC6800 CPU, touching back to 70's. HC08 are dead by stupid Freescale's marketing decision, now after NXP merger it is even more dead and the only reason I'm doing this is my stock of HC08 devices as well as my memories of old days when all you needed (and actually had) to get MCU going was serial port, assembler and datasheet. As I stated in my project description, this project is perhaps not very useful for wide audience, though important to me, from nostalgic reasons.
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