mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 251

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

11.4.10 Load of the registers with write buffers
FTMxCNTINH:L registers are always updated with their write buffer after both bytes have been written.
If (CLKS[1:0] = 00) then FTMxMODH:L registers are updated when their second byte is written
(independent of FTMEN bit). If (CLKS[1:0] not = 00) then FTMxMODH:L registers are updated with
their write buffer according to the FTMEN bit. If (CLKS[1:0] not = 00 and FTMEN = 1) then
FTMxMODH:L registers are updated by PWM synchronization
synchronization). If (CLKS[1:0] not = 00 and FTMEN = 0) then FTMxMODH:L registers are updated
according to the CPWMS bit, that is:
Freescale Semiconductor
with ELSnB:ELSnA = 1:0
with ELSnB:ELSnA = X:1
channel (n+1) output
channel (n+1) output
channel (n+1) output
channel (n+1) output
channel (n+1) match
channel (n+1) match
channel (n) output
channel (n) output
with COMP = 1
with COMP = 1
with COMP = 0
with COMP = 0
channel (n) match
channel (n) match
FTM counter
FTM counter
Figure 11-61. Channel (n+1) output in complementary mode with (ELSnB:ELSnA = X:1)
Figure 11-60. Channel (n+1) output in complementary mode with (ELSnB:ELSnA = 1:0)
Complementary mode is only available when (FTMEN = 1) and
(COMBINE = 1) and (CPWMS = 0). Complementary mode with (FTMEN
= 0) or (COMBINE = 0) or (CPWMS = 1) is not recommended and its
results are not guaranteed.
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
NOTE
(Section 11.4.11, “PWM
FlexTimer Module (FTMV1)
11-51