Motorola MCF5281 用户手册
27-66
MCF5282 User’s Manual
MOTOROLA
Signal Connection Considerations
When the gate closes, the active conversion completes before the queue goes idle.
When Q1 completes, both the CF1 bit sets and the SSE bit clears.
In this mode, the PF1 bit sets to reflect that a gate closing occurred before the queue
completed.
completed.
Figure 27-48 shows the timing for conversions in externally gated continuous scan mode
with the same assumptions as in Figure 27-47.
with the same assumptions as in Figure 27-47.
At the end of Q1,the completion flag CF1 sets and the queue restarts. If the queue starts a
second time and completes, the trigger overrun flag TOR1 sets.
second time and completes, the trigger overrun flag TOR1 sets.
Figure 27-47. Gated Mode, Single Scan Timing
0
8
0
8
0
CCW3
CCW2
CCW1
CCW0
LAST
CCW0
CCW1
R3
R2
R1
R0
LAST
R0
R1
TRIG1 (GATE)
EOC
QS
CWP
CWPQ1
Q1 RES
SSE
CF1
PF1
LAST
CCW0
CCW1
CCW1
CCW0
CCW2
CCW3