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Clocking
8.0
Clocking
The SoC clocking is controlled by the Clock Control Unit (CCU). There are two
primary clocks in SoC: a system clock and an RTC clock. The CCU uses the primary
clocks to generate secondary clocks to sub modules in the SoC. For low power
operation, the CCU supports Dynamic Frequency Scaling (DFS) and Dynamic Clock
Gating (DCG).
Table 18. Clocking Signals
Signal Name
HYB_XTALI
HYB_XTALO
RTC_XTALI
RTC_XTALO
RTC_CLK
SYS_CLK
The SoC contains a Real-Time Clock (RTC) with 32 bytes of battery-backed SRAM.
The SoC uses the RTC to keep track of time. The RTC operates from 1 Hz to 32.768
kHz. The RTC supports alarm functionality that allows scheduling an
Interrupt/Wake Event for a future time. The RTC operates in all SoC power states.
The RTC is powered from the same battery supply as the rest of the SoC and does
not have its own dedicated supply.
8.1
Signal Descriptions
Figure 18. RTC Topology
June 2017
Document Number: 334715-004EN
Direction/ Type
I/O
XTAL Input or External System Clock
I/O
XTAL Input
I/O
RTC XTAL Input
I/O
RTC XTAL Input
Output
RTC Clock Output
Output
System Clock
Description
Intel® Quark™ SE Microcontroller C1000
Platform Design Guide
39
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