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SH79F024XU Datasheet(PDF) 23 Page - SINOWEALTH Electronic Ltd |
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SH79F024XU Datasheet(HTML) 23 Page - SINOWEALTH Electronic Ltd |
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23 / 92 page  SH79F SH79F SH79F SH79F082 082 082 082 23 7.5 7.5 7.5 7.5 System System System System Clock Clock Clock Clock and and and and Oscillator Oscillator Oscillator Oscillator 7.5.1 7.5.1 7.5.1 7.5.1 F F F Feature eature eature eature � Three oscillator types: crystal oscillator, ceramic oscillator and interal RC � Built-in system clock prescaler 7.5.2 7.5.2 7.5.2 7.5.2 Clock Clock Clock Clock Definition Definition Definition Definition The SH79F082 have several internal clocks defined as below: OSCCLK OSCCLK OSCCLK OSCCLK:::: the oscillator clock from one of the three oscillator types (crystal oscillator, ceramic oscillator and interal RC) fOSC is defined as the OSCCLK frequency. tOSC is defined as the OSCCLK period. WDTCLK WDTCLK WDTCLK WDTCLK:::: the internal WDT RC clock. fWDT is defined as the WDTCLK frequency. tWDT is defined as the WDTCLK period. SYSCLK SYSCLK SYSCLK SYSCLK:::: system clock, the output of system clock prescaler. It is the CPU instruction clock. fSYS is defined as the SYSCLK frequency. tSYS is defined as the SYSCLK period. Description Description Description Description SH79F082 has three oscillator types: crystal oscillator (400kHz-16.6MHz), ceramic Oscillator (400kHz-16.6MHz) and interal RC (16.6MHz), which is selected by code option OP_OSC (Refer to code option section for details). The oscillator generates the basic clock pulse that provides the system clock to supply CPU and on-chip peripherals. Table Table Table Table 7 7 7 7....13 13 13 13 System Clock Control Register Note: Note: Note: Note: systerm clock is 1/12 of oscillator clock, when reset. It can be modified by software. B2H B2H B2H B2H Bit7 Bit7 Bit7 Bit7 Bit6 Bit6 Bit6 Bit6 Bit5 Bit5 Bit5 Bit5 Bit4 Bit4 Bit4 Bit4 Bit3 Bit3 Bit3 Bit3 Bit2 Bit2 Bit2 Bit2 Bit1 Bit1 Bit1 Bit1 Bit0 Bit0 Bit0 Bit0 CLKCON CLKCON CLKCON CLKCON - CLKS1 CLKS0 - - - - - R/W R/W R/W R/W - R/W R/W - - - - - Reset Reset Reset Reset Value Value Value Value ((((POR/WDT/LVR POR/WDT/LVR POR/WDT/LVR POR/WDT/LVR/PIN /PIN /PIN /PIN)))) - 1 1 - - - - - Bit Bit Bit Bit Number Number Number Number Bit Bit Bit Bit Mnemonic Mnemonic Mnemonic Mnemonic Description Description Description Description 6-5 6-5 6-5 6-5 CLKS[1:0] CLKS[1:0] CLKS[1:0] CLKS[1:0] System System System System Clock Clock Clock Clock p p p prescale rescale rescale rescalerrrr 00: fSYS = fOSC 01: fSYS = fOSC/2 10: fSYS = fOSC/4 11: fSYS = fOSC/12 |
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