09: Clocks and Timers/Counters

(timer rollover)

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Today

Where we’ve been:

I/O Peripherals, interrupts, embedded architecture

Where we’re going:

Time - clocks, timers, watchdogs

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Keeping track of time: clock signals

Square wave of a set frequency

Basis of control of a CPU/MCU

On MCU: multiple clocks signals common

Physical oscillators (vibrating crystals, often) act as sources of clock signals (configurable; fig 8.1)

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What can a CPU/MCU do with a clock signal?

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Challenge mode: why does an ADC need a clock signal?

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ADC needs clock signal to know when to take each iteration

delay(200)

interrupts

communication protocols

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Timing Diagrams

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