EM78P156 データシートの表示（PDF） - Elan Microelectronics Corp

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EM78P156

8-BIT MICRO-CONTROLLER

Elan Microelectronics Corp 

EM78P156E

Table 7 The summary of maximum operating speeds

Conditions

Two clocks

Four clocks

VDD (V)

2.5

3

5

6.4

2.5

3

5

6.5

Fxt max. (MHz)

8

12

18

20

16

24

36

40

2. Crystal Oscillator/Ceramic Resonators (XTAL)

EM78P156E can be driven by an external clock signal through the OSCI pin as shown in Fig.11

OSCI

OSCO

EM78P156E

Ext. Clock

Fig. 11 Circuit for External Clock Input

In the most applications, pin OSCI and pin OSCO can be connected with a crystal or ceramic resonator to generate

oscillation. Fig.12 depicts the circuit. It is the same no matter in the HXT mode or in the LXT mode. Table 8

recommends the values of C1 and C2. Since each resonator has its own attribute, users should refer to their specifications

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

EM78P156E XTAL

OSCO

RS

C2

Fig. 12 Circuit for Crystal/Resonator

* This specification is subject to be changed without notice. 8.11.1999

B3-18

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