參數(shù)資料
型號(hào)： ST52440G3
英文描述： MAX 7000 CPLD 64 MC 44-TQFP
中文描述： 8位重癥監(jiān)護(hù)病房與定時(shí)器/脈寬調(diào)制。模擬比較器?？煽毓? PWM定時(shí)器。水分散粒劑。提供了8K存儲(chǔ)器
文件頁(yè)數(shù)： 26/88頁(yè)
文件大小： 1162K
代理商： ST52440G3
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
number
of
external
components.
The ST52x430 oscillator circuit generates an
internal clock signal with the same period and
phase as that of the OSCin input pin. The
maximum frequency allowed is 20 Mhz.
Note: When the SCI peripheral is used only a 5,
10, or 20 MHz system clock must be used.
The system clock may be generated by using
either a quartz crystal, ceramic resonator or an
external clock.
The different methods of the clock generator are
illustrated in Figure 5.1.
When an external clock is used, it must be
connected on the OSCin pin, 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,
environment
temperature,
supply
voltage.
Figure 5.1 Oscillator Connections
Note: 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.
5.2 RESET
There are two Reset sources:
- RESET pin (external source.)
- WATCHDOG (internal source)
When a Reset event happens, the user program
restarts from the beginning.
The Reset pin is an input. An internal reset does
not affect this pin.
A Reset signal originated by external sources is
recognized instantaneously. The RESET pin may
be used to ensure VDD has risen to a point where
the MCU can operate correctly before the user
program runs. In working mode Reset must be set
to ‘1’ (see Table 2.1).
5.3 Power Saving Mode
There are two Power Saving modes: WAIT and
HALT mode. These conditions may be entered
using the WAIT or HALT instructions.
5.3.1 Wait Mode
Wait mode places the MCU in low power
consumption by stopping the CPU. All peripherals
OSCin
OSCout
ST52X430
OSCin
ST52X430
OSCout
CRYSTAL CLOCK
EXTERNAL CLOCK
Cl1
10pF
Cl2
10pF
CLOCK
INPUT
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