12.4.12 Deadtime insertion
The deadtime insertion is enabled when (DTEN = 1) and (DTVAL[5:0] is non- zero).
DEADTIME register defines the deadtime delay that can be used for all FTM channels.
The DTPS[1:0] bits define the prescaler for the system clock and the DTVAL[5:0] bits
define the deadtime modulo; that is, the number of deadtime prescaler clocks).
The deadtime delay insertion ensures that no two complementary signals (channel (n) and
(n+1)) drive the active state at the same time.
For POL(n) = 0, POL(n+1) = 0, and deadtime enabled, a rising edge on the output of
channel (n) remains low for the duration of the deadtime delay, after which the rising
edge appears on the output. Similarly, when a falling edge is due on the output of channel
(n), the channel (n+1) output remains low for the duration of the deadtime delay, after
which the channel (n+1) output will have a rising edge.
For POL(n) = 1, POL(n+1) = 1, and deadtime enabled, a falling edge on the output of
channel (n) remains high for the duration of the deadtime delay, after which the falling
edge appears on the output. Similarly, when a rising edge is due on the output of channel
(n), the channel (n+1) output remains high for the duration of the deadtime delay, after
which the channel (n+1) output will have a falling edge.
FTM counter
channel (n+1) match
channel (n) match
channel (n) output
(before deadtime
insertion)
channel (n+1) output
(before deadtime
insertion)
channel (n) output
(after deadtime
insertion)
channel (n+1) output
(after deadtime
insertion)
Figure 12-237. Deadtime insertion with ELSnB:ELSnA = 1:0, POL(n) = 0, and POL(n+1) =
0
Chapter 12 FlexTimer Module (FTM)
MC9S08PT60 Reference Manual, Rev. 4, 08/2014
Freescale Semiconductor, Inc.
371
Содержание MC9S08PT60
Страница 2: ...MC9S08PT60 Reference Manual Rev 4 08 2014 2 Freescale Semiconductor Inc...
Страница 34: ...MC9S08PT60 Reference Manual Rev 4 08 2014 34 Freescale Semiconductor Inc...
Страница 40: ...System clock distribution MC9S08PT60 Reference Manual Rev 4 08 2014 40 Freescale Semiconductor Inc...
Страница 120: ...Flash and EEPROM registers descriptions MC9S08PT60 Reference Manual Rev 4 08 2014 120 Freescale Semiconductor Inc...
Страница 200: ...Port data registers MC9S08PT60 Reference Manual Rev 4 08 2014 200 Freescale Semiconductor Inc...
Страница 228: ...System clock gating control registers MC9S08PT60 Reference Manual Rev 4 08 2014 228 Freescale Semiconductor Inc...
Страница 262: ...Human machine interfaces HMI MC9S08PT60 Reference Manual Rev 4 08 2014 262 Freescale Semiconductor Inc...
Страница 298: ...Functional Description MC9S08PT60 Reference Manual Rev 4 08 2014 298 Freescale Semiconductor Inc...
Страница 396: ...FTM Interrupts MC9S08PT60 Reference Manual Rev 4 08 2014 396 Freescale Semiconductor Inc...
Страница 440: ...Functional description MC9S08PT60 Reference Manual Rev 4 08 2014 440 Freescale Semiconductor Inc...
Страница 468: ...Initialization Application Information MC9S08PT60 Reference Manual Rev 4 08 2014 468 Freescale Semiconductor Inc...
Страница 570: ...Application information MC9S08PT60 Reference Manual Rev 4 08 2014 570 Freescale Semiconductor Inc...
Страница 648: ...Memory map and register description MC9S08PT60 Reference Manual Rev 4 08 2014 648 Freescale Semiconductor Inc...
Страница 676: ...Resets MC9S08PT60 Reference Manual Rev 4 08 2014 676 Freescale Semiconductor Inc...