MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 204

• Manufacturer Part Number: MC68376BGMAB20
• Description: IC MCU 32BIT 8K ROM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68376BGMAB20

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CAN, EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Ram Size: 7.5K x 8
• Voltage - Supply (vcc/vdd): 4.75 V ~ 5.25 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 160-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

8.12.3.3 Continuous-Scan Modes
8-22
MOTOROLA
When application software requires execution of multiple passes through a sequence
of conversions defined by a queue, a continuous-scan queue operating mode is
selected.
When a queue is programmed for a continuous-scan mode, the single-scan enable bit
in the queue control register does not have any meaning or effect. As soon as the
queue operating mode is programmed, the selected trigger event can initiate queue
execution.
In the case of the software initiated continuous-scan mode, the trigger event is gener-
ated internally and queue execution begins immediately. In the other continuous-scan
queue operating modes, the selected trigger event must occur before the queue can
start. A trigger overrun is recorded if a trigger event occurs during queue execution in
the external trigger continuous-scan mode and the periodic timer continuous-scan
mode. When a pause is encountered during a scan, another trigger event is required
for queue execution to continue. Software involvement is not required for queue
execution to continue from the paused state.
After queue execution is complete, the queue status is shown as idle. Since the con-
tinuous-scan queue operating modes allow an entire queue to be scanned multiple
times, software involvement is not required for queue execution to continue from the
idle state. The next trigger event causes queue execution to begin again, starting with
the first CCW in the queue.
By programming the MQ1 field in QACR1 or the MQ2 field in QACR2, the following
modes can be selected for queue 1 and/or 2:
• Software initiated continuous-scan mode
— When this mode is programmed, the trigger event is generated automatically
— While the time to internally generate and act on a trigger event is very short,
by the QADC, and queue execution begins immediately. If a pause is encoun-
tered, queue execution ceases for two QCLKs, while another trigger event is
generated internally; execution then continues. When the end-of-queue is
reached, another internal trigger event is generated, and queue execution be-
gins again from the beginning of the queue.
software can momentarily read the status conditions, indicating that the queue
is paused or idle. The trigger overrun flag is never set while in the software ini-
tiated continuous-scan mode.
It may not be possible to guarantee coherent samples when using
the continuous-scan queue operating modes since the relationship
between any two conversions may be variable due to programmable
trigger events and queue priorities.
QUEUED ANALOG-TO-DIGITAL CONVERTER MODULE
NOTE
USER’S MANUAL
MC68336/376