Diamond Systems PR-Z32-E-ST Base + Read Analog Input Status, STS Wait Dacbsy OVF Scanen

Base + 3	Read	Analog Input Status
Bit No.	7	6	5	4	3	2	1	0
Name	STS	SD	WAIT	DACBSY	OVF	SCANEN	G1	G0
STS	A/D status. 1 = A/D conversion or scan in progress, 0 = A/D is idle.
	If SCANEN = 0 (single conversion mode), STS goes high when an A/D conversion is
	started and stays high until the conversion is finished. If SCANEN = 1 (scan mode
	enabled), STS stays high during the entire scan. After starting a conversion in
	software, the program must monitor STS and wait for it to become 0 prior to reading
	A/D values from Base + 0 and Base + 1.
SD	Single-ended / Differential mode indicator. 1 = SE, 0 = DI.
WAIT	A/D input circuit status. 1 = A/D circuit is settling on a new value, 0 = ok to start
	conversion.
	WAIT goes high after the channel register (Base + 2) or the gain register (Base + 3)
	is changed. It stays high for 9 microseconds. The program should monitor this bit
	after writing to either register and wait for it to become 0 prior to starting an A/D
	conversion.
DACBSY	Indicates the DAC is busy updating (approx. 30 µS). 1 = Busy, 0 = Idle. Do not
	attempt to write to the DAC (registers 6 and 7) while DACBSY = 1.
OVF	FIFO Overflow bit. This bit indicates that the FIFO has overflowed, meaning that the
	A/D circuit has attempted to write data to it when it is full. This condition occurs when
	data is written into the FIFO faster than it is read out.
	When overflow occurs, the FIFO will not accept any more data until it is reset. The
	OVF condition is sticky, meaning that it remains true until the FIFO is reset, so the
	application program will be able to determine if overflow occurs. If overflow occurs,
	then you must either reduce the sample rate or increase the efficiency of your
	interrupt routine and/or operating system.
SCANEN	Scan mode readback (see Base + 3 Write above).
G1-G0	A/D gain setting readback (see Base + 3 Write above).

Prometheus CPU User Manual V1.44 Page 37