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ST7DALI Folha de dados(PDF) 55 Page - STMicroelectronics |
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55 / 141 page ST7DALI 55/141 11.2 12-BIT AUTORELOAD TIMER 2 (AT2) 11.2.1 Introduction The 12-bit Autoreload Timer can be used for gen- eral-purpose timing functions. It is based on a free- running 12-bit upcounter with an input capture reg- ister and four PWM output channels. There are 6 external pins: – Four PWM outputs – ATIC pin for the Input Capture function – BREAK pin for forcing a break condition on the PWM outputs 11.2.2 Main Features ■ 12-bit upcounter with 12-bit autoreload register (ATR) ■ Maskable overflow interrupt ■ Generation of four independent PWMx signals ■ Frequency 2KHz-4MHz (@ 8 MHz fCPU) – Programmable duty-cycles – Polarity control – Programmable output modes – Maskable Compare interrupt ■ Input Capture – 12-bit input capture register (ATICR) – Triggered by rising and falling edges – Maskable IC interrupt Figure 33. Block Diagram ATCSR CMPIE OVFIE OVF CK0 CK1 ICIE ICF 0 12-BIT AUTORELOAD REGISTER 12-BIT UPCOUNTER CMPF2 CMPF1 CMPF3 CMPF0 CMP REQUEST OVF INTERRUPT REQUEST fCPU ATIC 12-BIT INPUT CAPTURE REGISTER IC INTERRUPT REQUEST ATR ATICR fCOUNTER CNTR 32 MHz (1 ms fLTIMER @ 8MHz) CMPFx bit POL- ARITY OPx bit PWMx COMP- PARE fPWM OEx bit 4 PWM Channels INTERRUPT timebase DCR0H DCR0L Preload Preload on OVF Event 12-BIT DUTY CYCLE VALUE (shadow) IF TRAN=1 1 |
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