Motorola MCF5282, MCF5281 user manual QACR2 Field Descriptions, Queue 2 Operating Modes, CIE2, BQ2

Register Descriptions

			Table 27-8. QACR2 Field Descriptions
Bit(s)	Name		Description
15	CIE2	Queue 2 completion software interrupt enable. Enables an interrupt request upon completion of
		queue 2. The interrupt request is initiated when the conversion is complete for the last CCW in
		queue 2.
		1	Enable queue 2 completion interrupt.
		0	Disable queue 2 completion interrupt.
14	PIE2	Queue 2 pause interrupt enable. Enables an interrupt request when queue 2 enters the pause
		state. The interrupt request is initiated when conversion is complete for a CCW that has the
		pause bit set.
		1	Enable the queue 2 pause interrupt.
		0	Disable the queue 2 pause interrupt.
13	SSE2	Queue 2 single-scan enable. Enables a single-scan of queue 2 after a trigger event occurs. SSE2
		may be set during the same write cycle that sets the MQ2 bits for one of the single-scan queue
		operating modes. The single-scan enable bit can be written to 1 or 0, but is always read as a 0,
		unless the QADC is in test mode. The QADC clears SSE2 when the single-scan is complete.
		1	Allow a trigger event to start queue 2 in a single-scan mode.
		0	Trigger events are ignored for queue 2 single-scan modes.
12–8	MQ2	Selects the operating mode for queue 2. Table 27-9shows the bits in the MQ1 field which
		enable different queue 2 operating modes.
7	RESUME	Selects the resumption point for queue 2 after its operation is suspended due to a queue 1 trigger
		event. If RESUME is changed during the execution of queue 2, the change is not recognized
		until an end-of-queue condition is reached or the operating mode of queue 2 is changed.
		1	After suspension, begin execution with the aborted CCW in queue 2.
		0	After suspension, begin execution with the first CCW of queue 2 or the current subqueue of
			queue 2.
6–0	BQ2	Beginning of queue 2. Denotes the CCW location where queue 2 begins. This allows the length
		of queue 1 and queue 2 to vary. The BQ2 field also serves as an end-of-queue condition for
		queue 1.

		Table 27-9. Queue 2 Operating Modes
	MQ2[12:8]	Operating Modes
	00000	Disabled mode, conversions do not occur
	00001	Software triggered single-scan mode (started with SSE2)
	00010	Externally triggered rising edge single-scan mode
	00011	Externally triggered falling edge single-scan mode
	00100	Interval timer single-scan mode: time = QCLK period x 27
	00101	Interval timer single-scan mode: time = QCLK period x 28
	00110	Interval timer single-scan mode: time = QCLK period x 29
	00111	Interval timer single-scan mode: time = QCLK period x 210
	01000	Interval timer single-scan mode: time = QCLK period x 211
	01001	Interval timer single-scan mode: time = QCLK period x 212
	01010	Interval timer single-scan mode: time = QCLK period x 213
27-18		MCF5282 User’s Manual	MOTOROLA