Diamond Systems PR-Z32-EA-ST, PR-Z32-E-ST Prometheus A/D Operating Modes, LOW, High, Ainte Scanen

Prometheus A/D Operating Modes

The following control bits and values are referenced in the descriptions in the table below.

AINTE		Base + 4 bit 0
SCANEN		Base + 3 bit 2
FIFO threshold		Base + 5 bits 5-0
STS		Base + 3 bit 7
LOW, HIGH		4-bit channel nos. in Base + 2
ADCLK		Base + 4 bit 4
AINTE	SCANEN	Operation
0	0	Single A/D conversions are triggered by write to B+0.
		STS stays high during the A/D conversion.
		No interrupt occurs.
		The user program monitors STS and reads A/D data when it goes low.
0	1	A/D scans are triggered by write to B+0. All channels between LOW and HIGH will
		be sampled.
		STS stays high during the entire scan (multiple A/D conversions).
		No interrupt occurs.
		The user program monitors STS and reads all A/D values when it goes low.
1	0	Single A/D conversions are triggered by the source selected with ADCLK.
		STS stays high during the A/D conversion.
		A/D interrupt occurs when the FIFO reaches its programmed threshold.
		The interrupt routine reads out a number of samples equal to the FIFO threshold
		each time it runs.
1	1	A/D scans are triggered by the source selected with ADCLK.
		STS stays high during the entire scan (multiple A/D conversions).
		A/D interrupt occurs when the FIFO reaches its programmed threshold.
		The interrupt routine reads out a number of samples equal to the FIFO threshold
		each time it runs.

Prometheus CPU User Manual V1.44 Page 52