![TENX TECHNOLOGY TM57PE10 Скачать руководство пользователя страница 26](http://html.mh-extra.com/html/tenx-technology/tm57pe10/tm57pe10_user-manual_1087886026.webp)
Advance Information
UM-TM57PE10_E
8-Bit Microcontroller
26
tenx technology inc.
Preliminary
Rev 1.4, 2012/01/19
3.7 System Clock Oscillator
System clock can be operated in four different oscillation modes, which is selected by setting the CLKS
in the SYSCFG register. In Slow/Fast Crystal mode, a crystal or ceramic resonator is connected to the
Xin and Xout pins to establish oscillation. In external RC mode, the external resistor and capacitor
determine the oscillation frequency. In the fast internal RC mode, the on chip oscillator generates 4/8
MHz system clock. In this mode, PCB Layout may have strong effect on the stability of Internal Clock
Oscillator. Since power noise degrades the performance of Internal Clock Oscillator, placing power
supply bypass capacitors 1 uF and 0.1 uF very close to VDD/VSS pins improves the stability of clock
and the overall system.
X
IN
X
OUT
C1
C2
Xrc
External Oscillator Circuit
(Crystal or Ceramic)
External RC Oscillator
Vss
Vdd
1uF
0.1uF
Internal RC Mode