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数据搜索系统，热门电子元器件搜索 |
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ST7FLCD1 数据表(PDF) 77 Page - STMicroelectronics |
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ST7FLCD1 数据表(HTML) 77 Page - STMicroelectronics |
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77 / 95 page  77/95 ST7FLCD1 8-bit Timer (TIMA) 13 8-bit Timer (TIMA) 13.1 Introduction Timer A is an 8-bit programmable free-running downcounter driven by a programmable prescaler. This block also has a buzzer. The block diagram is shown in Figure 41. 13.2 Main Features ● Programmable Prescaler: fCPU divided by 1, 8 or 64. ● Overflow status flag and maskable interrupt ● Reduced power mode ● Independent buzzer output with 4 programmable tones 13.3 Functional Description Timer A is a 8-bit downcounter and its associated 8-bit register is loaded as start value of the downcounter each time it has reached the 00h value. A flag indicates that the downcounter rolled over the 00h value. The buzzer has 4 distinct tones. Before the downcounter prescaler block, the frequency is divided by 2048. fTIMER = fCPU/2048 Note: In One-shot mode, the counter stops at 00h (low power state). Figure 41: Timer A (TIMA) Block Diagram 8-bit downcounter Preload Register Prescaler OVF OVFE BUZE fCPU OVF Interrupt Buzzer Prescaler Request TIMCSRA 8 TAR fTIMER TIMCPRA 1 / 8 / 64 TB1 TB0 BUZ1 BUZ0 Fixed Prescaler % 2048 Interrupt BUZOUT Buzzer Output Pin |
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