EM78P341 datasheet(76/102 Pages) EMC

76 / 102 page

EM78P341N/342N/343N

8-Bit Microprocessor with OTP ROM

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Product Specification (V1.0) 12.01.2006

(This specification is subject to change without further notice)

In most applications, Pin OSCI and Pin OSCO can be connected with a crystal or

ceramic resonator to generate oscillation. Fig. 6-18 below depicts such a circuit. The

same applies to the HXT1 mode, HTX2 mode, LXT1 mode and LXT2 mode.

OSCI

OSCO

Crystal

Fig. 6-18 Crystal/Resonator Circuit

The following table provides the recommended values for C1 and C2. Since each

resonator has its own attribute, user should refer to the resonator specifications for the

appropriate values of C1 and C2. RS, a serial resistor, may be required for AT strip cut

crystal or low frequency mode.

Capacitor selection guide for crystal oscillator or ceramic resonators

Oscillator Type

Frequency Mode

Frequency

C1 (pF)

C2 (pF)

455kHz

100~150

2.0 MHz

20~40

Ceramic Resonators

HXT

4.0 MHz

10~30

32.768kHz

100kHz

LXT

200kHz

455kHz

20~40

20~150

1.0 MHz

15~30

2.0 MHz

Crystal Oscillator

HXT

4.0 MHz

EM78P341 Datasheet(PDF) 76 Page - ELAN Microelectronics Corp

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