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ST7LITEU05 Arkusz danych(PDF) 58 Page - STMicroelectronics |
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ST7LITEU05 Arkusz danych(HTML) 58 Page - STMicroelectronics |
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58 / 115 page  ST7LITEU05 ST7LITEU09 58/115 11.2 12-BIT AUTORELOAD TIMER (AT) 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 a PWM output chan- nel. 11.2.2 Main Features ■ 12-bit upcounter with 12-bit autoreload register (ATR) ■ Maskable overflow interrupt ■ PWM signal generator ■ Frequency range 2KHz-4MHz (@ 8 MHz fCPU) – Programmable duty-cycle – Polarity control – Maskable Compare interrupt ■ Output Compare Function Figure 37. Block Diagram ATCSR CMPIE OVFIE OVF CK0 CK1 0 0 0 12-BIT AUTORELOAD VALUE 12-BIT UPCOUNTER CMPF0 bit CMPF0 CMP INTERRUPT REQUEST OVF INTERRUPT REQUEST fCPU ATR POL- ARITY OP0 bit PWM0 COMP- PARE fCOUNTER fPWM OE0 bit CNTR (1 ms timebase fLTIMER DCR0H DCR0L Update on OVF Event Preload Preload @ 8MHz) 70 on OVF Event 0 1 12-BIT DUTY CYCLE VALUE (shadow) OE0 bit IF OE0=1 1 |
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