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On Thu, 16 Feb 2023 at 15:05, Lorenzo Donati <> wrote:
> The AVR 8-bit architecture (used in ATmega328 MCUs, for and other uChip
> former Atmel MCUs) has a half carry bit in its flag register.

it's useful, specially in slow processors, how many have used the
classic Z80 sequence

add ax,0x40
adc ax,0x90

Francisco Olarte.