SN8P1700
8-bit micro-controller build-in 12-bit ADC
SONiX TECHNOLOGY CO., LTD
Page 175
Revision 1.93
EXTERNAL OSCILLATOR CIRCUIT
Crystal/Ceramic Resonator Oscillator Circuit
VCC
Power Supplier
GND
VDD
XIN
XOUT
VSS
CRYSTAL
20PF
20PF
CORRECT
FALSE
GND
Power Supplier
Micro-controller
VCC
Micro-controller
VDD
XIN
VSS
XOUT
CRYSTAL
20PF
20PF
Using Crystal/Ceramic resonator to generate the external clock needs to connect two 20pF bypass capacitor from XIN
and XOUT pin of micro-controller to VSS. The two terminals of crystal/ceramic resonator connect to XIN and XOUT pin
of micro-controller. The VSS of the bypass capacitor must been connected to the VSS pin of micro-controller first. It is
necessary to get a stable oscillator output. Don’t connect the VSS of the bypass capacitor to the power source
individually. That makes the oscillator to been affected by the power ground easily. The external oscillator circuit must
approach to the micro-controller as closely as possible.