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UPSD3422 Datasheet(PDF) 180 Page - STMicroelectronics |
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UPSD3422 Datasheet(HTML) 180 Page - STMicroelectronics |
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180 / 293 page  Programmable counter array (PCA) with PWM uPSD34xx 180/293 Figure 61. PWM mode - (x8) programmable frequency Note: m = 0: n = 0, 1, or 2 m = 1: n = 3, 4, or 5 27.9 PWM mode - fixed frequency, 16-bit The operation of the 16-bit PWM is the same as the 8-bit PWM with fixed frequency. In this mode, one or all the TCM can be configured to have a fixed frequency PWM output on the port pins. The PWM frequency is depending on the clock input frequency to the 16-bit Counter. The duty cycle of each TCM module can be specified in the CAPCOMHn and CAPCOMLn Registers. When the 16-bit PCA_Counter is equal or greater than the values in registers CAPCOMHn and CAPCOMLn, the PWM output is switched to a high state. When the PCA_Counter overflows, CEXn is asserted low. CLR PCACHm PWM FREQ COMPARE PWMFm = PCACLm PCACLm CAPCOMHn CEXn ENABLE ENABLE 8 8 PWMFm 8-bit COMPARATORm 8-bit COMPARATORn CAPCOMLn MATCH S R Q Q SET CLR 8 0 0 TCMMODEn 0 0 0 EINTF E_COMP CAP_PE CAP_NE MATCH TOGGLE PWM1 PWM0 AI07860 |
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