Qacr2 Field Descriptions; Queue 2 Operating Modes - Motorola ColdFire MCF5281 User Manual

Register Descriptions
Bit(s) Name
15 CIE2
14 PIE2
13 SSE2
12–8 MQ2
7 RESUME
6–0 BQ2
MQ2[12:8]
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
27-18
Table 27-8. QACR2 Field Descriptions
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.
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.
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.
Selects the operating mode for queue 2. Table 27-9 shows the bits in the MQ1 field which
enable different queue 2 operating modes.
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.
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
Disabled mode, conversions do not occur
Software triggered single-scan mode (started with SSE2)
Externally triggered rising edge single-scan mode
Externally triggered falling edge single-scan mode
Interval timer single-scan mode: time = QCLK period x 2
Interval timer single-scan mode: time = QCLK period x 2
Interval timer single-scan mode: time = QCLK period x 2
Interval timer single-scan mode: time = QCLK period x 2
Interval timer single-scan mode: time = QCLK period x 2
Interval timer single-scan mode: time = QCLK period x 2
Interval timer single-scan mode: time = QCLK period x 2
MCF5282 User's Manual
Description
Operating Modes
7
8
9
10
11
12
13
MOTOROLA