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C161 Datasheet(PDF) 125 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 125 Page - Infineon Technologies AG |
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125 / 400 page  &3, &ORFN*HQHUDWLRQ User’s Manual 6-9 1999-08 6.4 Clock Drivers The operating clock signal I CPU is distributed to the controller hardware via several clock drivers which are disabled under certain circumstances. The real time clock RTC is clocked via a separate clock driver which delivers the prescaled oscillator clock (contrary to the other clock drivers). The table below summarizes the different clock drivers and their function, especially in power reduction modes: Note: Disabling PCD by setting bit PCDDIS stops the clock signal for all connected modules. Make sure that all these modules are in a safe state before stopping their clock signal. The port input and output values will not change while PCD is disabled (ASC0 and SSC will still operate, if active), CLKOUT will be high if enabled. Please also respect the hints given in section „Flexible Peripheral Management“ of chapter „Power Management“. Table 6-2 Clock Drivers Description Clock Driver Clock Signal Active mode Idle mode Power Down and Sleep mode Connected Circuitry CCD CPU Clock Driver I CPU ON Off Off CPU, internal memory modules (IRAM, ROM/OTP/Flash) ICD Interface Clock Driver I CPU ON ON Off ASC0, WDT, SSC, interrupt detection circuitry PCD Peripheral Clock Driver I CPU Control via PCDDIS Control via PCDDIS Off (X)Peripherals (timers, etc.) except those driven by ICD, interrupt controller, ports RCD RTC Clock Driver I RTC ON ON Control via PDCON / SLEEP- CON Realtime clock |
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