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Reaction Module (REACM)
MPC5644A Microcontroller Reference Manual, Rev. 6
732
Freescale Semiconductor
For a programmed MIN_PWD value, a pulse wider than (1)
does not set the SCDF flag.
For a programmed (RAN MIN_PWD) value, a pulse narrower
than or equal to (RAN M 1) does not set the OCDF
flag.
Figure 23-31. Fails detected by the modulation monitoring
describes in more detail an open circuit detection using the Hold-off timer. Note that the
Hold-off timer is used when the output is at the ON state, which means HOD is used to drive the outputs,
thus hold-off functionally is not required at this moment. The Hold-off timer is loaded with MIN_PWD
and starts counting. After a time-out occurs RANGE_PWD value is loaded and the Hold-off counter starts
counting again. An open circuit is detected if the timer times-out on the second RANGE_PWD counting
and the PWM pulse is still high, meaning that the outputs did not switched to LOD. In this case the OCDF
flag is set in the CHSR, Channel Status register, of the corresponding channel. See
A - Normal operation
B - open circuit
C - short circuit
wide pulse
narrow pulse
current cannot achieve
predefined limit
current passed
predefined limit
Summary of Contents for MPC5644A
Page 2: ...MPC5644A Microcontroller Reference Manual Rev 6 2 Freescale Semiconductor...
Page 24: ...MPC5644A Microcontroller Reference Manual Rev 6 24 Freescale Semiconductor...
Page 26: ...MPC5644A Microcontroller Reference Manual Rev 6 26 Freescale Semiconductor...
Page 52: ...Introduction MPC5644A Microcontroller Reference Manual Rev 6 52 Freescale Semiconductor...
Page 56: ...Memory Map MPC5644A Microcontroller Reference Manual Rev 6 56 Freescale Semiconductor...
Page 1228: ...Decimation Filter MPC5644A Microcontroller Reference Manual Rev 6 1228 Freescale Semiconductor...
Page 1440: ...FlexCAN Module MPC5644A Microcontroller Reference Manual Rev 6 1440 Freescale Semiconductor...