em78p134n ELAN Microelectronics Corp, em78p134n Datasheet - Page 46

• Manufacturer Part Number: em78p134n
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

EM78P134N
8-Bit Microcontroller with OTP ROM
40 •
5.10.2 Crystal Oscillator/Ceramic Resonators (Crystal)
The EM78P134N can be driven by an external clock signal through the OSCO pin as
illustrated below.
In most applications, Pin OSCI and Pin OSCO can be connected with a crystal or
ceramic resonator to generate oscillation. Figure 5-18 depicts such a circuit. The
same applies to the HXT mode and the LXT mode.
The following table provides the recommended values for C1 and C2. Since each
resonator has its own attribute, refer to the resonator specifications for appropriate
values of C1 and C2. RS, a serial resistor, may be required for AT strip cut crystal or
low frequency mode.
Figure 5-17 External Clock Input Circuit
Figure 5-18 Crystal/Resonator Circuit
OSCO
OSCI
OSCO
OSCI
(This specification is subject to change without further notice)
Crystal
RS
Product Specification (V1.6) 06.02.2010
C1
C2
Ext. Clock