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EM78P152S Datasheet(PDF) 26 Page - List of Unclassifed Manufacturers

Part # EM78P152S
Description  8-Bit Microcontroller with OTP ROM
PDF  52 Pages
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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EM78P152S Datasheet(HTML) 26 Page - List of Unclassifed Manufacturers

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EM78P152/3S
8-Bit Microcontroller with OTP ROM
5.7 Oscillator
5.7.1 Oscillator Modes
The EM78P152/3S can be operated in four different oscillator modes, such as External
RC oscillator mode (ERC), Internal RC oscillator mode (IRC), High Crystal oscillator
mode (HXT), and Low Crystal oscillator mode (LXT). The desired mode can be
selected by programming OSC1 and OSC2 in the Code Option register. The Table
below describes how these four oscillator modes are defined.
Table 5-4
Oscillator Modes Defined by OSC
Mode
OSC1
OSC2
IRC (Internal RC oscillator mode)
1
1
ERC (External RC oscillator mode)
1
0
HXT (High Crystal oscillator mode)
0
1
LXT(Low Crystal oscillator mode)
0
0
Note: The transient point of system frequency between HXT and LXY is 400kHz.
The maximum operational frequency of the crystal/resonator under different VDD is
listed below.
Table 5-5
Summary of Maximum Operating Speeds
Conditions
VDD
Max Freq. (MHz)
2.3
4.0
3.0
8.0
Two cycles with two clocks
5.0
20.0
5.7.2 Crystal Oscillator/Ceramic Resonators (Crystal)
The EM78P152/3S can be driven by an external clock signal through the OSCI pin as
shown in the following figure.
OSCI
OSCO
EM 78P153S
Ext. Clock
Figure 5-11 Circuit for External Clock Input
22
•
Product Specification (V1.8) 09.08.2009
(This specification is subject to change without further notice)



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