参数资料
型号: ST52E430B/D
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 20 MHz, MICROCONTROLLER, CDIP32
封装: WINDOWED, SHRINK, CERAMIC, DIP-32
文件页数: 49/120页
文件大小: 502K
代理商: ST52E430B/D
34/120
ST52T430/E430
5 CLOCK, RESET & POWER SAVING MODE
5.1 System Clock
The ST52x430 Clock Generator module generates
the internal clock for the internal Control Unit, ALU
and on-chip peripherals and it is designed to
require a minimum of external components.
The ST52x430 oscillator circuit generates an
internal clock signal with the same period and
phase as at the OSCin input pin. The maximum
frequency allowed is 20 Mhz.
REMARK: When the SCI peripheral is used,
only 5, 10 or 20 MHz system clock must be
used.
The system clock may be generated by using
either a quartz crystal, or a ceramic resonator
(CERALOC); or, at least, by means of an external
clock.
The different clock generator options connection
methods are shown in Figure 5.1.
When an external clock is used, it must be
connected on the pin OSCin while OSCout can be
floating.
The crystal oscillator start-up time is a function of
many variables: crystal parameters (especially
Rs), oscillator load capacitance (CL), IC
parameters, ambient temperature, supply voltage.
OSCin
OSCout
ST52X430
OSCin
ST52X430
OSCout
CRYSTAL CLOCK
EXTERNAL CLOCK
Cl1
10pF
Cl2
10pF
CLOCK
INPUT
Figure 5.1 Oscillator Connections
It must be observed that the crystal or ceramic
leads and circuit connections must be as short as
possible. Typical values for CL1, CL2 are 10pF for a
20 MHz crystal.
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