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ST7DALI Datasheet(PDF) 57 Page - STMicroelectronics |
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ST7DALI Datasheet(HTML) 57 Page - STMicroelectronics |
57 / 141 page ST7DALI 57/141 12-BIT AUTORELOAD TIMER (Cont’d) Figure 36. PWM Signal from 0% to 100% Duty Cycle Output Compare Mode To use this function, load a 12-bit value in the DCRxH and DCRxL registers. When the 12-bit upcounter (CNTR) reaches the value stored in the DCRxH and DCRxL registers, the CMPF bit in the PWMxCSR register is set and an interrupt request is generated if the CMPIE bit is set. Note: The output compare function is only availa- ble for DCRx values other than 0 (reset value). Break Function The break function is used to perform an emergen- cy shutdown of the power converter. The break function is activated by the external BREAK pin (active low). In order to use the BREAK pin it must be previously enabled by soft- ware setting the BPEN bit in the BREAKCR regis- ter. When a low level is detected on the BREAK pin, the BA bit is set and the break function is activat- ed. Software can set the BA bit to activate the break function without using the BREAK pin. When the break function is activated (BA bit =1): – The break pattern (PWM[3:0] bits in the BREAK- CR) is forced directly on the PWMx output pins (after the inverter). – The 12-bit PWM counter is set to its reset value. – The ARR, DCRx and the corresponding shadow registers are set to their reset values. – The PWMCR register is reset. When the break function is deactivated after ap- plying the break (BA bit goes from 1 to 0 by soft- ware): – The control of PWM outputs is transferred to the port registers. COUNTER t FFDh FFEh FFFh FFDh FFEh FFFh FFDh FFEh DCRx=000h DCRx=FFDh DCRx=FFEh DCRx=000h ATR= FFDh fCOUNTER 1 |
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