Chapter 4. Peripheral Hardware
4.1.1 Oscillation Circuit
Oscillation circuit is designed to be used either with a ceramic resonator or crystal
oscillator. Fig. 4.2-(a) shows circuit diagrams using a crystal (or ceramic) oscillator.
As shown in the diagram, oscillation circuits can be constructed by connecting a
oscillator between Xout and Xin. Clock from oscillation circuit makes CPU clock via
clock pulse generator, and then enters prescaler to make peripheral hardware clock.
alternately, the oscillator may be driven from an external source as shown is Fig. 4.2.-
¡ È
¡ È
(b). In the Standby(STOP) mode, oscillatiion stop, Xout state goes to HIGH , Xin
¡ È
¡ È
state goes to LOW , and built-in feed back resistor is disabled.
(a) External Crystal (Ceramic) oscillator circuit
Cout
Xout
Xin
Cin
(b) External clock input circuit
Xout
Xin
External clock
Fig. 4.2 Oscillator configurations
*. Recommendable resonator
Frequency
ResonatorMaker Part Name
Load Capacitor OperatingVoltage
CQ
KYOCERA
KYOCERA
TDK
ZTA4.00MG
KBR- 4.0MKC
KBR- 4.0MSB
FCR4.0MC5
FCR4.0M5
Cin=Cout=30pF
Cin=Cout=open
Cin=Cout=33pF
Cin=Cout=open
Cin=Cout=33pF
Cin=Cout=open
2.2 ~ 4.0V
2.2 ~ 4.0V
2.2 ~ 4.0V
2.2 ~ 4.0V
2.2 ~ 4.0V
2.2 ~ 4.0V
4.0MHz
TDK
TDK
CCR4.0MC3
¡ Ø
MC type is building in load capacitior.CCR type is chip type.
4 - 2
HYNIX [ HYNIX SEMICONDUCTOR ]
