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參數(shù)資料
| 型號： | ST52X420 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | ADC |
| 英文描述： | 8-BIT INTELLIGENT CONTROLLER UNIT (ICU) Three Timer/PWMs, ADC, WDG |
| 中文描述： | 8位智能控制器病房（ICU）3個定時器/的PWM，ADC的，水分散粒劑 |
| 文件頁數(shù)： | 34/84頁 |
| 文件大?。?/td> | 1274K |
| 代理商： | ST52X420 |
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ST52T410/ST52T420/E420
34/84
5 CLOCK, RESET & POWER SAVING MODE
5.1 System Clock
The
ST52T410/ST52x420
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
ST52T410/ST52x420
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
.
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
R
s
),
oscillator
load
parameters, environment temperature, supply
voltage.
Clock
Generator
oscillator
circuit
capacitance
(CL),
IC
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 V
DD
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
ST52X420
OSCin
ST52X420
OSCout
CRYSTAL CLOCK
EXTERNAL CLOCK
Cl1
10pF
Cl2
10pF
CLOCK
INPUT
FLOATING
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