參數(shù)資料
型號(hào)： L9805
廠商： 意法半導(dǎo)體
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Super Smart Power Motor Driver with 8-BIT MCU, CAN Interface, 16K EPROM, 256Bytes RAM, 128 Bytes EEPROM, 10 Bit ADC, WDG, 2 Timers, 2 PWM Modules, Ful
中文描述： 超級(jí)智能型電動(dòng)馬達(dá)驅(qū)動(dòng)器，帶有8位微控制器，CAN接口，16K的存儲(chǔ)器，256Bytes RAM內(nèi)存，128字節(jié)EEPROM，10位ADC，水分散粒劑，2定時(shí)器，2個(gè)PWM模塊，涪陵
文件頁(yè)數(shù)： 14/103頁(yè)
文件大?。?/td> 853K
代理商： L9805
14/103
L9805
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 (f
CPU
) is de-
rived 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 fre-
quency of the f
CPU
; this clock signal is also routed
to the on-chip peripherals (except the CAN). The
CPU clock signal consists of a square wave with a
duty cycle of 50%.
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 5
is recommended when
using a crystal, and
Table 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.
Table 2. Recommended Values for 16 MHz
Crystal Resonator
Note:
R
SMAX
is the equivalent serial resistor of the
crystal (see crystal specification).
C
OSCIN
,C
OSCOUT
:
Maximum total capacitances on
pins OSCIN and OSCOUT (the value includes the
external capacitance tied to the pin plus the para-
sitic capacitance of the board and of the device).
Rp:
External shunt resistance. Recommended val-
ue for oscillator stability is 1M
.
Figure 4. External Clock Source Connections
Figure 5. Crystal/Ceramic Resonator
Figure 6. Clock Prescaler Block Diagram
R
SMAX
C
OSCIN
C
OSCOUT
R
P
40
56pF
56pF
1-10 M
60
47pF
47pF
1-10 M
150
22pF
22pF
1-10 M
OSC
in
OSC
out
EXTERNAL
CLOCK
NC
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
to CAN
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