Lecture 15 Flashcards
Clock Signals
1
Q
What does the clock input determine
A
- how fast instructions execute
- Rate of serial communication
- Time between A-to-D samples
2
Q
Microcontrollers execute what type of logic?
A
Sequential logic
3
Q
What is the finite amount of time to respond to changes to inputs?
A
Propagation delay
4
Q
The 2 internal to microcontroller clock sources
A
Resistor-capacitor cirucit (RC oscillator)
Phase-locked loop (PLL) for frequency multiplication
5
Q
The 4 External to microcontroller clock sources
A
CMOS clock
Crystal (quarts)
Ceramic resonator
Resistor-capacitor (RC oscillator)
6
Q
What is a PLL
A
Phase detector, filter and Voltage-controlled-oscillator (VCO)
7
Q
What is the distribution of clocks called
A
Clock tree
8
Q
Name of the primary clock
A
System clock (SSYSCLK)
9
Q
HSI
A
High speed internal
16Mhz
10
Q
HSE
A
High speed external
4 to 26 Mhz
