Re: [Simulavr-devel] [PATCH] use static callbacks instead of template param for IOReg

[Klaus Rudolph]

Hi again,

> Example:
> SBI of bit 0 in PINB register should toggle (xor) PORTB.PB0. Using RMW
> approach, we read PINB = 0xff (because DDRB is input/tristate, read as
> '1' for each pin), we OR the bitmask (1<<0)=1 on top of it (=0xff) and
> write it back to PINB, *which toggles all PORTB bits* --> bug.

PINB register is read only. What you want to achieve?

Regards
 Klaus