參數(shù)資料
型號(hào): ST7285C
廠商: 意法半導(dǎo)體
英文描述: 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
中文描述: 8位微控制器48,000鐵路發(fā)展策略光盤,3K內(nèi)存,ADC,兩個(gè)定時(shí)器,2個(gè)SPI,I2C和脊髓損傷接口
文件頁數(shù): 15/117頁
文件大?。?/td> 748K
代理商: ST7285C
15/117
ST7285C
3 CLOCKS, RESET, INTERRUPTS & POWER SAVING MODES
3.1 CLOCK SYSTEM
3.1.1 General Description
The MCU accepts either a Crystal or Ceramic res-
onator, or an external clock signal to drive the in-
ternal oscillator. The internal clock (CPU CLK run-
ning at f
CPU
) is derived from the external oscillator
frequency (f
OSC
)
.
The external Oscillator clock is
first divided by 2, and an additional division factor
of 2, 4, 8, or 16 can be applied, in Slow Mode, to
reduce the frequency of the CPU clock (see
note 1); this clock signal is also routed to the on-
chip peripherals. The CPU clock signal consists of
a square wave with a duty cycle of 50%.
Figure 4. External Clock Source Connections
Figure 5. Equivalent Crystal Circuit
3.1.2 Crystal Resonator
The internal oscillator is designed to operate with
an AT-cut parallel resonant quartz crystal resona-
tor in the frequency range specified for f
osc
. The
circuit shown in Figure 6 is recommended when
using a crystal, andTable 2 lists the recommend-
ed capacitance and feedback resistance values.
The crystal and associated components should be
mounted as close as possible to the input pins in
order to minimize output distortion and start-up
stabilisation time.
Use of an external CMOS oscillator is recom-
mended when crystals outside the specified fre-
quency ranges are to be used.
Figure 6. Crystal/Ceramic Resonator
Figure 7. Clock Prescaler Block Diagram
Note 1: Additional division factor of CPU clock is only available on L5/L6.
OSC
in
OSC
out
EXTERNAL
CLOCK
NC
OSC
in
OSC
out
R
S
L
1
C
1
C
0
OSC
in
OSC
out
C
OSCin
C
OSCout
R
P
OSC
in
OSC
out
C
OSCin
C
OSCout
R
P
%2
%2,4,8,16
CPUCLK
to CPU and
Peripherals
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