HMS87C5216 Datasheet, PDF (65/76 Pages) List of Unclassifed Manufacturers – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD

HMS87C5216
16. OSCILLATION CIRCUIT
Oscillation circuit is designed to be used either with a ceramic
resonator or crystal oscillator. Fig. 4.2-(a) shows circuit dia-
grams using a crystal (or ceramic) oscillator. As shown in the di-
agram, 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 pres-
caler to make peripheral hardware clock. Alternately, the oscilla-
tor may be driven from an external source as shown is Fig. 4.2.-
(b). In the Standby (STOP) mode, oscillatiion stop, Xout state
goes to ``HIigh``, Xin 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
Figure 16-1 Oscillator configurations
* Recommendable resonator
Frequency
4.0 MHz
Resonator Maker
CQ
TDK
TDK
TDK
Part Name
ZTA4.00MG
FCR4.0MC5
FCR4.0M5
CCR4.0MC3
Load Capacitor
Cin=Cout=30pF
Cin=Cout=open
Cin=Cout=33pF
Operating Voltage
2.2 ~ 4.0V
2.2 ~ 4.0V
2.2 ~ 4.0V
2.2 ~ 4.0V
* MC type is building in load capacitior.CCR type is chip type.
SEP. 2004 Ver 1.01