EM78P156EL Просмотр технического описания (PDF) - Elan Microelectronics Corp

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производитель

EM78P156EL

8-BIT MICRO-CONTROLLER

Elan Microelectronics Corp 

EM78P156EL

OTP ROM

Table 9 The Summary of Maximum Operating Speeds

Conditions

Two cycles with two clocks

VDD

2.3

3.0

5.0

Fxt max.(MHz)

4.0

8.0

20.0

2. Crystal Oscillator/Ceramic Resonators (XTAL)

EM78P156EL can be driven by an external clock signal through the OSCI pin as shown in Fig. 11

below.

OSCI

OSCO

EM78P156EL

Ext. Clock

Fig. 11 Circuit for External Clock Input

In the most applications, pin OSCI and pin OSCO can 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 10 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.

C1

OSCI

EM78P156EL

XTAL

OSCO

RS

C2

Fig. 12 Circuit for Crystal/Resonator

This specification is subject to change without prior notice.

27

07.29.2004 (V1.3)

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