Diamond Power Products MM-48-AT Base + Write Fifo Control Register, Fifoth Fifoen Scanen

Base + 10	Write		FIFO Control Register
Bit No.	7	6		5	4	3	2	1	0
Name						PAGE	FIFOTH	FIFOEN	SCANEN
PAGE	Page number for registers at Base + 12 through Base + 15
	Page 0:		82C54 counter/timer access
	Page 1:		Calibration registers
FIFOTH	FIFO threshold: 0 = 1024 samples (half full), 1 = 256 samples (1/8 full)
FIFOEN	FIFO enable:

1Enable FIFO operation; if interrupts are enabled, interrupt requests will occur when the FIFO reaches or exceeds the threshold selected with FIFOTH.

0Disable FIFO operation; if interrupts are enabled, interrupts will occur after each A/D conversion or scan is completed.

SCANEN Scan enable:

1A/D scan mode enabled; FIFO will fill up with data for a single scan, and ADBUSY will stay high until an entire scan is complete. If interrupts are enabled, interrupts will occur at the end of the scan. If FIFOEN = 1 and SCANEN = 1, the interrupt will occur at the end of the scan that causes the FIFO to reach or exceed its half-full point (256 samples).

0Scan mode disabled; the ADBUSY bit will remain high for a single conversion

Base + 10	Read	FIFO Status Register
Bit No.	7	6	5		4	3	2		1	0
Name	OVF	HF	8F		EF	PAGE	FIFOTH	FIFOEN		SCANEN
OVF	FIFO overflow flag: 0 = no overflow, 1 = overflow
	Overflow is defined as the state when the FIFO is full and another A/D
	conversion occurs before any data is read out of the FIFO. In an overflow
	condition the FIFO contents are preserved, and no new data will be written to the
	FIFO. To clear an overflow condition, the FIFO must be reset with the FIFORST
	bit in register 8.
8F	FIFO 1/8 full flag:
	0	FIFO is less than 1/8 full (256 samples)
	1	FIFO is greater than or equal to 1/8 full
HF	FIFO half full flag
	0	FIFO is less than half full (1024 or less samples)
	1	FIFO is greater than half full (1025 or more samples)
EF	FIFO empty flag: 0 = FIFO is not empty, 1 = FIFO is empty
PAGE	Readback of PAGE bit described above
FIFOTH	Readback of FIFO threshold bit described above
FIFOEN	Readback of FIFOEN bit described above
SCANEN	Readback of SCANEN bit described above
				Diamond-MM-48-AT User Manual V1.01					Page 20