EM78P447NAM datasheet(25/57 Pages) EMC

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EM78P447NAM Datasheet(PDF) 25 Page - ELAN Microelectronics Corp

Part No.	EM78P447NAM

Description	8-BIT MICRO-CONTROLLER

Download	57 Pages

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Manufacturer	EMC [ELAN Microelectronics Corp]

Direct Link	http://www.emc.com.tw

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EM78P447N

OTP ROM

Table 8 The Summary of Maximum Operating Speeds

Conditions

VDD

Fxt max.(MHz)

2.3

4.0

3.0

8.0

Two cycles with two clocks

5.0

20.0

2. Crystal Oscillator/Ceramic Resonators(XTAL)

EM78P447N can be driven by an external clock signal through the OSCI pin as shown in Fig. 10

below.

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

to generate oscillation. Fig. 12 depicts such circuit. The same thing applies whether it is in the HXT

mode or in the LXT mode. Table 9 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

EM 78P447S

Ext. Clock

Fig. 10 Crystal/Resonator Circuit

OSCI

OSCO

EM 78P447S

XTAL

Fig. 11 Crystal/Resonator Circuit

This specification is subject to change without prior notice.

10.21.2004 (V1.0)

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