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Chapter 14 Pulse Width Modulator with Fault Protection (PMF15B6CV3)
MC9S12ZVM Family Reference Manual Rev. 1.3
Freescale Semiconductor
545
Figure 14-72. Setting asserted LDOK bit at PWM reload event
14.4.12.2 Global Load Enable
If a global load enable bit GLDOKA, B, or C is set, the global load OK bit defined on device level as input
to the PMF replaces the function of the related local LDOKA, B, or C bits. The global load OK signal is
typically shared between multiple IP blocks with the same double buffer scheme. Software handling must
be transferred to the global load OK bit at the chip level.
14.4.12.3 Load Frequency
The LDFQ3, LDFQ2, LDFQ1, and LDFQ0 bits in the PWM control register (PMFFQCx) select an
integral loading frequency of 1 to 16-PWM reload opportunities. The LDFQ bits take effect at every PWM
reload opportunity, regardless the state of the related load okay bit or global load OK. The
half
bit in the
PMFFQC register controls half-cycle reloads for center-aligned PWMs. If the
half
bit is set, a reload
opportunity occurs at the beginning of every PWM cycle and half cycle when the count equals the
modulus. If the half bit is not set, a reload opportunity occurs only at the beginning of every cycle. Reload
opportunities can only occur at the beginning of a PWM cycle in edge-aligned mode.
NOTE
Setting the half bit takes effect immediately. Depending on whether the
counter is incrementing or decrementing at this point in time, reloads at
even-numbered reload frequencies (every 2, 4, 6,... reload opportunities)
will occur only when the counter matches the modulus or only when the
counter equals zero, respectively (refer to example of reloading at every two
opportunities in
NOTE
Loading a new modulus on a half cycle will force the count to the new
modulus value minus one on the next clock cycle. Half cycle reloads are
possible only in center-aligned mode. Enabling or disabling half-cycle
reloads in edge-aligned mode will have no effect on the reload rate.
bus clock
LDOK write
LDOK bit
PWM reload
bus clock
LDOK write
LDOK bit
PWM reload
Содержание MC9S12ZVM series
Страница 116: ...Chapter 2 Port Integration Module S12ZVMPIMV1 MC9S12ZVM Family Reference Manual Rev 1 3 116 Freescale Semiconductor ...
Страница 242: ...Chapter 7 ECC Generation Module SRAM_ECCV1 MC9S12ZVM Family Reference Manual Rev 1 3 242 Freescale Semiconductor ...
Страница 384: ...Chapter 10 Supply Voltage Sensor BATSV3 MC9S12ZVM Family Reference Manual Rev 1 3 384 Freescale Semiconductor ...
Страница 484: ...Chapter 13 Programmable Trigger Unit PTUV2 MC9S12ZVM Family Reference Manual Rev 1 3 484 Freescale Semiconductor ...
Страница 662: ...Chapter 17 Gate Drive Unit GDUV4 MC9S12ZVM Family Reference Manual Rev 1 3 662 Freescale Semiconductor ...
Страница 684: ...Chapter 18 LIN Physical Layer S12LINPHYV2 MC9S12ZVM Family Reference Manual Rev 1 3 684 Freescale Semiconductor ...
Страница 740: ...Chapter 19 128 KB Flash Module S12ZFTMRZ128K512V2 MC9S12ZVM Family Reference Manual Rev 1 3 740 Freescale Semiconductor ...
Страница 756: ...Appendix A MCU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 756 Freescale Semiconductor ...
Страница 772: ...Appendix D LINPHY Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 772 Freescale Semiconductor ...
Страница 776: ...Appendix E GDU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 776 Freescale Semiconductor ...
Страница 788: ...Appendix I MSCAN Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 788 Freescale Semiconductor ...
Страница 790: ...Appendix J Package Information MC9S12ZVM Family Reference Manual Rev 1 3 790 Freescale Semiconductor ...