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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST92185B 数据表(PDF) 62 Page - STMicroelectronics |
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ST92185B 数据表(HTML) 62 Page - STMicroelectronics |
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62 / 178 page  62/178 ST92185B - TIMING AND CLOCK CONTROLLER 5 TIMING AND CLOCK CONTROLLER 5.1 FREQUENCY MULTIPLIERS Three on-chip frequency multipliers generate the proper frequencies for: the Core/Real time Periph- erals, the Display related time base. For both the Core and the Display frequency mul- tipliers, a 4 bit programmable feed-back counter allows the adjustment of the multiplying factor to the application need (a 4 MHz or 8 MHz crystal is assumed). Figure 33. Timing and Clock Controller Block Diagram Frequency Multiplier FML(3:0) FMEN Xtal Oscillator Asynch. Handler FMSL Main Clock Controller Divide by 2 MCFM OSCIN OSCOUT Fimf Divide by 2 SLDIV2 FMEN Frequency Multiplier Skew Corrector Synchronized DOTCK / 2 to Display SKWL(3:0) SKWEN Hsync SKHPLS PXFM (Synchronized DOTCK) Divide by 2 (2X Pixel clock for 1X width characters) 4 MHz real time Divide by 2 to Display Storage RAM (TRI) Div-2 MODER.5 SKDIV2 SKDIV2 VR02095A Async. Handler Memory Wait BREQ WFI CPUCLK Prescaler 1 to 8 Clock Control INTCLK ST9 Clock Control Unit (RCCU) |
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