Motorola ColdFire MCF5281 - Manual (Page 551)

Queued Analog-to-Digital Converter (QADC)
Freescale Semiconductor 28-13
Table 28-6. QACR1 Field Descriptions
Bit(s) Name Description
15 CIE1 Queue 1 completion interrupt enable. Enables an interrupt request upon completion
of queue 1. The interrupt request is initiated when the conversion is complete for the
last CCW in queue 1.
1 Enable queue 1 completion interrupt.
0 Disable queue 1 completion interrupt.
14 PIE1 Queue 1 pause interrupt enable. Enables an interrupt request when queue 1 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 1 pause interrupt.
0 Disable the queue 1 pause interrupt.
13 SSE1 Queue 1 single-scan enable. Enables a single-scan of queue 1 after a trigger event
occurs. SSE1 may be set during the same write cycle that sets the MQ1 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
SSE1 when the single-scan is complete.
1 Allow a trigger event to start queue 1 in a single-scan mode.
0 Trigger events are ignored for queue 1 single-scan modes.
12–8 MQ1n Selects the operating mode for queue 1. Table 28-7 shows the bits in the MQ1 field
which enable different queue 1 operating modes.
7–0 — Reserved, should be cleared.
Table 28-7. Queue 1 Operating Modes
MQ1[12:8] Operating Mode
00000 Disabled mode, conversions do not occur
00001 Software-triggered single-scan mode (started with SSE1)
00010 External-trigger rising-edge single-scan mode
00011 External-trigger falling-edge single-scan mode
00100 Interval timer single-scan mode: time = QCLK period
×
2 7
00101 Interval timer single-scan mode: time = QCLK period
×
2
8
00110 Interval timer single-scan mode: time = QCLK period
×
2
9
00111 Interval timer single-scan mode: time = QCLK period
×
2
10
01000 Interval timer single-scan mode: time = QCLK period
×
2
11
01001 Interval timer single-scan mode: time = QCLK period
×
2
12
01010 Interval timer single-scan mode: time = QCLK period
×
2
13
01011 Interval timer single-scan mode: time = QCLK period
×
2
14
01100 Interval timer single-scan mode: time = QCLK period
×
2
15
01101 Interval timer single-scan mode: time = QCLK period
×
2
16
01110 Interval timer single-scan mode: time = QCLK period
×
2
17
01111 Externally gated single-scan mode (started with SSE1)
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3