EM78F651NAMSSLASHNAMJ datasheet(40/58 Pages) EMC

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EM78F651N

8-Bit Microcontroller

•

Product Specification (V1.1) 10.20.2006

(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 6-11 depicts such circuit. The same

thing applies whether it is in the HXT mode or in the LXT mode. Table 13 provides

the recommended values of C1 and C2. Since each resonator has its own attribute,

user should refer to its specification for appropriate values of C1 and C2. RS, a serial

resistor, may be necessary for AT strip cut crystal or low frequency mode.

OSCI

OSCO

EM78F651N

XTAL

Fig. 6-11 Circuit for Crystal/Resonator

Table 13 Capacitor Selection Guide for Crystal Oscillator or Ceramic Resonator

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

1.0MHz

15~30

2.0MHz

Crystal Oscillator

HXT

4.0MHz

OSCI

EM78F651N

7404

330

Crystal

7404

Fig. 6-12 Circuit for Crystal/Resonator-Series Mode

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