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XC2230L Datasheet(PDF) 91 Page - Infineon Technologies AG |
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XC2230L Datasheet(HTML) 91 Page - Infineon Technologies AG |
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91 / 112 page  XC2230L, XC2234L XC2000 Family / Econo Line Electrical Parameters Data Sheet 87 V1.3, 2015-02 4.7.2.2 Wakeup Clock When wakeup operation is selected (SYSCON0.CLKSEL = 00 B), the system clock is derived from the low-frequency wakeup clock source: f SYS = fWU. In this mode, a basic functionality can be maintained without requiring an external clock source and while minimizing the power consumption. 4.7.2.3 Selecting and Changing the Operating Frequency When selecting a clock source and the clock generation method, the required parameters must be carefully written to the respective bit fields, to avoid unintended intermediate states. Many applications change the frequency of the system clock ( f SYS) during operation in order to optimize system performance and power consumption. Changing the operating frequency also changes the switching currents, which influences the power supply. To ensure proper operation of the on-chip EVRs while they generate the core voltage, the operating frequency shall only be changed in certain steps. This prevents overshoots and undershoots of the supply voltage. To avoid the indicated problems, recommended sequences are provided which ensure the intended operation of the clock system interacting with the power system. Please refer to the Programmer’s Guide. Table 28 System PLL Parameters Parameter Symbol Values Unit Note / Test Condition Min. Typ. Max. VCO output frequency f VCO CC 50 − 110 MHz VCOSEL=00 B; VCOmode= controlled 10 − 40 MHz VCOSEL=00 B; VCOmode=free running 100 − 160 MHz VCOSEL=01 B; VCOmode= controlled 20 − 80 MHz VCOSEL=01 B; VCOmode=free running |
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