MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 494
MMC2114
Manufacturer Part Number
MMC2114
Description
M CORE Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MMC2114.pdf
(654 pages)
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Queued Analog-to-Digital Converter (QADC)
19.10.4 Disabled Mode
19.10.5 Reserved Mode
19.10.6 Single-Scan Modes
Advance Information
494
NOTE:
When disabled mode is selected, the queue is not active. Trigger events
cannot initiate queue execution. When both queue 1 and queue 2 are
disabled, there is no possibility of encountering wait states when
accessing CCW table and result RAM. When both queues are disabled,
it is safe to change the QCLK prescaler values.
Reserved mode is available for future mode definitions. When reserved
mode is selected, the queue is not active. The behavior is the same as
disabled mode.
A single-scan queue operating mode is used to execute a single pass
through a sequence of conversions defined by a queue. By
programming the MQ1 field in QACR1 or the MQ2 field in QACR2, these
modes can be selected:
Queue 2 cannot be programmed for externally gated single-scan mode.
In all single-scan queue operating modes, queue execution is enabled
by writing the single-scan enable bit to a 1 in the queue’s control register.
The single-scan enable bits, SSE1 and SSE2, are provided for queue 1
and queue 2, respectively.
Until a queue’s single-scan enable bit is set, any trigger events for that
queue are ignored. The single-scan enable bit may be set to a 1 during
the same write cycle that selects the single-scan queue operating mode.
The single-scan enable bit can be written only to 1, but will always
read 0. Once set, writing the single-scan enable bit to 0 has no effect.
•
•
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
Queued Analog-to-Digital Converter (QADC)
Software-initiated single-scan mode
Externally triggered single-scan mode
Externally gated single-scan mode
Interval timer single-scan mode
Go to: www.freescale.com
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
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