Maxim Integrated MAXQ7666 - Manual (Page 212)

MAXQ7665/MAXQ7666 User’s Guide
5-15
ENABLE HF OSCILLATOR
HFE = 1
SELECT CLOCK DIVIDE VALUE:
PMME, CD1 AND CD0 BITS
CRYSTAL/RESONATOR-BASED
CODE EXECUTION
SELECT XIN/XOUT CAPACITOR VALUES
AND DRIVE STRENGTH:
HFIC[1:0] AND HFOC[1:0]
SELECTING EXTERNAL CRYSTAL/RESONATOR AS SYSTEM CLOCK
SELECT EXTERNAL CRYSTAL/RESONATOR AS
CLOCK SOURCE XT = 1
~600 μs (4096 CRYSTAL/RESONATOR CLOCK CYCLES)
WARMUP DELAY
WAIT FOR HIGH-FREQ OSCILLATOR
FLAG TO BE SET: XHFRY = 1?
NO
Figure 5-4. Selecting External Crystal/Resonator as System Clock
AGC
R F = 812k Ω
8MHz
XOUT XIN USER-SELECTABLE
(HFIC[1:0]) INPUT
CAPACITANCE
USER-SELECTABLE
(HFOC[1:0]) OUTPUT
CAPACITANCE
EXTERNAL CAPACITOR
NOT NEEDED. USE BUILT-IN
INPUT CAPACITANCE INSTEAD.
EXTERNAL CAPACITOR
NOT NEEDED. USE BUILT-IN
OUTPUT CAPACITANCE INSTEAD.
OPTIONAL SERIES RESISTOR
USER-SELECTABLE CRYSTAL DRIVE STRENGTH (MAXQ7666)
MAXQ7665/MAXQ7666
Figure 5-5. High-Frequency Oscillator Application Configuration
Maxim Integrated