[SOLVED] Software set, hardware clear register behavior?

[yuhiub90]

Guys,

In hardware/software interfacing, can I implement a mechanism like this, software write 1 to a bit of register to initiate operation, hardware receive 1, do its job and automatically clear the bit to 0.
I see the mechanism of hardware set, software clear in interrupt handling, but don't know if the reverse one exists in embedded programming world.

Thanks

 

[KlausST]

Hi,

Both is useful.

Hardware set:
Imagine a UART receive periferal. In coming data set a bit. If you fetch it per software you can clear the bit.

Hardware clear:
Imagine a UART transmit periferal. Trans mit a data to the periferal by software and automatically a busy bit is set.
It is cleared by hardware when transmission is complete.

Klaus