Datasheet

128
7734Q–AVR–02/12
AT90PWM81/161
12.18 PSC Input Mode 14: Fixed Frequency Edge Retrigger PSC and Deactivate Output
Figure 12-37. PSC behavior versus PSCn Input A in Mode 14.
The output frequency is not modified by the occurrence of significative edge of retriggering input.
Figure 12-38. PSC behavior versus PSCn Input B in Mode 14.
The output is deactivated while retriggering input is active.
The output of the PSC is set to an inactive state and the corresponding ramp is not aborted. The
output stays in an inactive state while the Retrigger/Fault input is active. The PSC runs at con-
stant frequency.
12.18.1 Available Input Mode according to Running Mode
Some input modes are not consistent with some running modes. Table 12-8 gives the input
modes which are valid according to running modes.
PSCOUTn0
PSCOUTn1
DT0 OT0
DT1 OT1
DT0 OT0 DT0 OT0
DT1 OT1 DT1 OT1
DT0 OT0
DT1 OT1
PSCn Input A
PSCOUTn0
PSCOUTn1
DT0
OT 0
DT1
OT 1
DT0 OT0 DT0 OT0
DT1 OT1 DT1 OT1
DT0 OT0
DT1 OT1
PSCn Input B
Table 12-8. Available input modes according to running modes.
Input mode
number: 1 ramp mode 2 ramp mode 4 ramp mode Centered mode
1 Valid Valid Valid Do not use
2 Do not use Valid Valid Do not use
3 Do not use Valid Valid Do not use
4 Valid Valid Valid Valid
5 Do not use Valid Valid Do not use
6 Do not use Valid Valid Do not use