em78p210n ELAN Microelectronics Corp, em78p210n Datasheet - Page 48

• Manufacturer Part Number: em78p210n
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

EM78P210N
8-Bit Microcontroller with OTP ROM
42 •
In most applications, Pin OSCI and Pin OSCO can be connected with a crystal or
ceramic resonator to generate oscillation. Figure 6-17 below depicts such circuit. The
same applies to the HXT 1, 2 modes and the LXT 1, 2 modes.
The following table provides the recommended values for C1 and C2. Since each
resonator has its own attribute, user should refer to the resonator specifications for
appropriate values of C1 and C2. RS, a serial resistor, may be required for AT strip cut
crystal or low frequency mode. Figure 6-13-1 is PCB layout suggestion. When the
system works in Crystal mode (16MHz), a 10KΩ is connected between OSCI and
OSCO.
Capacitor selection guide for crystal oscillator or ceramic resonators:
Ceramic Resonators
Crystal Oscillator
Oscillator Type
Figure 6-14 Crystal/Resonator Circuit
OSCO
LXT2 (32.768kHz)
Frequency Mode
OSCI
(100K~1 MHz)
(100K~1 MHz)
(6~16 MHz)
(1~6 MHz)
(1~6 MHz)
HXT2
HXT1
LXT1
HXT
LXT
Crystal
RS
(This specification is subject to change without further notice)
Frequency
100kHz
200kHz
455kHz
1 MHz
1.0 MHz
2.0 MHz
4.0 MHz
32.768kHz
100kHz
200kHz
455kHz
1 MHz
455kHz
1.0 MHz
2.0 MHz
4.0 MHz
6.0 MHz
6.0 MHz
8.0 MHz
12.0 MHz
16.0 MHz
C1
C2
Product Specification (V1.2) 04.22.2008
67pF
30pF
30pF
30pF
30pF
30pF
30pF
20pF
67pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
15pF
C1 (pF)
67pF
30pF
30pF
30pF
30pF
30pF
30pF
20pF
67pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
30pF
15pF
C2 (pF)