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EM78P447NAM Datasheet(PDF) 25 Page - ELAN Microelectronics Corp

Part # 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
Logo EMC - ELAN Microelectronics Corp

EM78P447NAM Datasheet(HTML) 25 Page - ELAN Microelectronics Corp

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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
C1
C2
XTAL
RS
Fig. 11 Crystal/Resonator Circuit
This specification is subject to change without prior notice.
10.21.2004 (V1.0)
25


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