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參數(shù)資料
| 型號： | ST72371 |
| 廠商： | 意法半導體 |
| 英文描述： | 8-Bit MCUs with 16K ROM/OTP/EPROM, 512 Bytes RAM, ADC, DAC (PWM), Timer, IIC and SCI(8位微控制器(8M)) |
| 中文描述： | 8 - 16K的光碟/雙層/存儲器，512字節(jié)RAM，ADC和DAC的器（PWM），定時器，IIC和脊髓損傷（8位微控制器（8米）位MCU） |
| 文件頁數(shù)： | 15/94頁 |
| 文件大?。?/td> | 642K |
| 代理商： | ST72371 |
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15/94
ST72371/ST72372
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 3,
and an additional division factor of 2 can be ap-
plied if Slow Mode is selected by resetting the
SMS bit in the Miscellaneous Register. This reduc-
es the frequency of the f
CPU
; the 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%.
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 8 is recommended when
using a crystal, and Table 5 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 5
.
Recommended Crysta
l
Values
Legend:
C
L1
, C
L2
= Maximum total capacitance on pins
OSCIN and OSCOUT (the value includes the ex-
ternal capacitance tied to the pin plus the parasitic
capacitance of the board and of the device).
R
SMAX
= Maximum series parasitic resistance of
the quartz allowed.
Note:
The tables relate to the quartz crystal only
(not ceramic resonator).
3.1.2 External Clock
An external clock may be applied to the OSCIN in-
put with the OSCOUT pin not connected. The t
OX-
OV
specifications does not apply when using an
external clock input. The equivalent specification
of the external clock source should be used in-
stead of t
OXOV
(see Electrical Characteristics).
Figure 8. Crystal/Ceramic Resonator
Figure 9. Clock Prescaler Block Diagram
24 Mhz
R
SMAX
C
L1
C
L2
Unit
Ohms
pf
pf
70
22
22
25
47
47
20
56
56
OSCIN
OSCOUT
C
OSCIN
C
OSCOUT
R
P
OSCIN
OSCOUT
C
OSCIN
C
OSCOUT
R
P
%3
%2
CPUCLK
to CPU and
Peripherals
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相關代理商/技術參數(shù) |
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|---|---|
| ST72371N4B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH 16K ROM/OTP/EPROM,512 BYTES RAM, ADC, DAC (PWM), TIMER, I2C AND SCI |
| ST72371N4B1/XXX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROCONTROLLER|8-BIT|ST72 CPU|CMOS|SDIP|56PIN|PLASTIC |
| ST72371N4T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH 16K ROM/OTP/EPROM,512 BYTES RAM, ADC, DAC (PWM), TIMER, I2C AND SCI |
| ST72372 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH 16K ROM/OTP/EPROM,512 BYTES RAM, ADC, DAC (PWM), TIMER, I2C AND SCI |
| ST72372J4B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH 16K ROM/OTP/EPROM,512 BYTES RAM, ADC, DAC (PWM), TIMER, I2C AND SCI |
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