Knowledge Base

Pushes communications status flags for the serial port at address pp into X.

This differs from the same instruction without the leading ‘a’ in that it explicitly nominates a serial port address (pp) rather than the default serial port.

The flags are:

Bit 0 = Rx buffer is full

Bit 1 = Rx buffer is empty

Bit 2 = Tx buffer is full

Bit 3 = Tx buffer is empty

Dialect exclusions: Not available in dialects before 29

Can only exist on boards that have an uncommitted serial port other than the programming port.