Rainbow Electronics AT91CAP9S250A - Manual (Page 660)

660
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
Figure 38-11. WAVSEL = 01 Without Trigger
Figure 38-12. WAVSEL = 01 With Trigger
38.5.11.4 WAVSEL = 11
When WAVSEL = 11, the value of TC_CV is incremented from 0 to RC. Once RC is reached, the
value of TC_CV is decremented to 0, then re-incremented to RC and so on. See
Figure 38-13 .
A trigger such as an external event or a software trigger can modify TC_CV at any time. If a trig-
ger occurs while TC_CV is incrementing, TC_CV then decrements. If a trigger is received while
TC_CV is decrementing, TC_CV then increments. See
Figure 38-14 .
RC Compare can stop the counter clock (CPCSTOP = 1) and/or disable the counter clock (CPC-
DIS = 1).
Time
Counter Value
R
C
R
B
R
A
TIOB
TIOA
Counter decremented by compare match with 0xFFFF
0xFFFF
Waveform Examples
Time
Counter Value
TIOB
TIOA
Counter decremented by compare match with 0xFFFF
0xFFFF
Waveform Examples
Counter decremented
by trigger
Counter incremented
by trigger
R
C
R
B
R
A