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MMC2107 - Freescale Semiconductor

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<strong>Freescale</strong> <strong>Semiconductor</strong>, Inc.<br />

Queued Analog-to-Digital Converter (QADC)<br />

Situation S5 (Figure 18-27) shows that when multiple queue 2 trigger<br />

events are detected while queue 1 is busy, the trigger overrun error bit<br />

is set, but queue 1 execution is not disturbed. Situation S5 also shows<br />

that the effect of queue 2 trigger events during queue 1 execution is the<br />

same when the pause feature is in use in either queue.<br />

T1<br />

T1<br />

Q1:<br />

C1<br />

C2<br />

C3<br />

C4<br />

nc...<br />

<strong>Freescale</strong> <strong>Semiconductor</strong>, I<br />

Q1<br />

Q2<br />

QS<br />

IDLE<br />

IDLE<br />

Q2:<br />

T2 T2<br />

PF1<br />

TOR1<br />

ACTIVE<br />

TRIG<br />

C1<br />

ACTIVE<br />

0000 1000 1011 0110 0101 1001 1011 0010<br />

C2<br />

PAUSE<br />

PF2<br />

PAUSE<br />

T2 T2<br />

CF1<br />

TOR1<br />

ACTIVE<br />

TRIG<br />

Figure 18-27. CCW Priority Situation 5<br />

The remaining situations, S6 through S11, show the impact of a queue 1<br />

trigger event occurring during queue 2 execution. Queue 1 is higher in<br />

priority, the conversion taking place in queue 2 is aborted, so that there<br />

is not a variable latency time in responding to queue 1 trigger events.<br />

C3<br />

ACTIVE<br />

C4<br />

CF2<br />

IDLE<br />

IDLE<br />

0000<br />

Technical Data <strong>MMC2107</strong> – Rev. 2.0<br />

458 Queued Analog-to-Digital Converter (QADC) MOTOROLA<br />

For More Information On This Product,<br />

Go to: www.freescale.com

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