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NUC220-LE1N Fiches technique(PDF) 64 Page - Nuvoton Technology Corporation |
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NUC220-LE1N Fiches technique(HTML) 64 Page - Nuvoton Technology Corporation |
64 / 107 page NUC100/120xxxDN Aug 31, 2015 Page 64 of 107 Rev 1.01 6.3.4 Peripherals Clock The peripherals clock can be selected as different clock source depends on the clock source select control registers (CLKSEL1, CLKSEL2 and CLKSEL3). 6.3.5 Power-down Mode Clock When chip enters Power-down mode, system clocks, some clock sources, and some peripheral clocks will be disabled. Some clock sources and peripherals clocks are still active in Power-down mode. The clocks still kept active are listed below: Clock Generator Internal 10 kHz low speed oscillator clock External 32.768 kHz low speed crystal clock Peripherals Clock (when IP adopt external 32.768 kHz low speed crystal oscillator or 10 kHz low speed oscillator as clock source) 6.3.6 Frequency Divider Output This device is equipped with a power-of-2 frequency divider which is composed by16 chained divide-by-2 shift registers. One of the 16 shift register outputs selected by a sixteen to one multiplexer is reflected to CLKO function pin. Therefore there are 16 options of power-of-2 divided clocks with the frequency from Fin/2 1 to F in/2 16 where Fin is input clock frequency to the clock divider. The output formula is Fout = Fin/2 (N+1), where F in is the input clock frequency, Fout is the clock divider output frequency and N is the 4-bit value in FSEL (FRQDIV[3:0]). When writing 1 to DIVIDER_EN (FRQDIV[4]), the chained counter starts to count. When writing 0 to DIVIDER_EN (FRQDIV[4]), the chained counter continuously runs till divided clock reaches low state and stay in low state. 11 10 01 00 HCLK 32.768 kHz 4~24 MHz 22.1184 MHz FRQDIV_S (CLKSEL2[3:2]) FDIV_EN(APBCLK[6]) FRQDIV_CLK Note: Before clock switching, both the pre-selected and newly selected clock sources must be turned on and stable. Figure 6-14 Clock Source of Frequency Divider |
Numéro de pièce similaire - NUC220-LE1N |
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Description similaire - NUC220-LE1N |
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