
MOTOROLA
7-18
DIGITAL CONTROL
QADC
REFERENCE MANUAL
PIE2 — Queue 2 Pause Software Interrupt Enable
PIE2 enables an interrupt 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.
0 = Disable the pause interrupt associated with queue 2.
1 = Enable an interrupt after the conversion of the sample requested by a CCW in
queue 2 which has the pause bit set.
SSE2 — Queue 2 Single-Scan Enable Bit
SSE2 enables a single-scan of queue 2 to start after a trigger event occurs. The SSE2
bit may be set to a one during the same write cycle when the MQ2 bits are set for one
of the single-scan queue operating modes. The single-scan enable bit can be written
as a one or a zero, but is always read as a zero, unless a test mode is selected. The
SSE2 bit enables a trigger event to initiate queue execution for any single-scan oper-
ation on queue 2. The QADC clears the SSE2 bit when the single-scan is complete.
0 = Trigger events are not accepted for single-scan modes.
1 = Accept a trigger event to start queue 2 in a single-scan mode.
MQ2[12:8] — Queue 2 Operating Mode
The MQ2 field selects the queue operating mode for queue 2.
Table 7-5
shows the bits in the MQ2 field which enable different queue 2 operating
modes.
Table 7-5 Queue 2 Operating Modes
MQ2[12:8]
00000
00001
00010
00011
00100
Operating Modes
Disabled mode, conversions do not occur
Software triggered single-scan mode (started with SSE2)
External trigger rising edge single-scan mode (on ETRIG2 pin)
External trigger falling edge single-scan mode (on ETRIG2 pin)
Interval timer single-scan mode: time = QCLK period x 2
7
Interval timer single-scan mode: time = QCLK period x 2
8
Interval timer single-scan mode: time = QCLK period x 2
9
Interval timer single-scan mode: time = QCLK period x 2
10
Interval timer single-scan mode: time = QCLK period x 2
11
Interval timer single-scan mode: time = QCLK period x 2
12
Interval timer single-scan mode: time = QCLK period x 2
13
Interval timer single-scan mode: time = QCLK period x 2
14
Interval timer single-scan mode: time = QCLK period x 2
15
Interval timer single-scan mode: time = QCLK period x 2
16
Interval timer single-scan mode: time = QCLK period x 2
17
Reserved mode
Reserved mode
Continuous-scan software triggered mode
External trigger rising edge continuous-scan mode (on ETRIG2 pin)
External trigger falling edge continuous-scan mode (on ETRIG2 pin)
Periodic timer continuous-scan mode: time = QCLK period x 2
7
Periodic timer continuous-scan mode: time = QCLK period x 2
8
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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