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参数资料
| 型号： | ST72101G2B1/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封装： | 0.400 INCH, PLASTIC, SDIP-32 |
| 文件页数： | 8/85页 |
| 文件大小： | 879K |
| 代理商： | ST72101G2B1/XXX |
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Obsolete
Product(s)
- Obsolete
Product(s)
16/85
ST72101/ST72212/ST72213
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 (fCPU) is de-
rived from the external oscillator frequency (fOSC).
The external Oscillator clock is first divided by 2,
and division factor of 32 can be applied if Slow
Mode is selected by setting the SMS bit in the Mis-
cellaneous Register. This reduces the frequency
of the fCPU; the clock signal is also routed to the
on-chip peripherals.
The internal oscillator is designed to operate with
an AT-cut parallel resonant quartz crystal resona-
tor in the frequency range specified for fosc. The
circuit shown in Figure 13 is recommended when
using a crystal, and Table 6 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 6. Recommended Values for 16 MHz
Crystal Resonator (C0<7pF)
C0: parasitic shunt capacitance of the quartz crys-
tal.
RSMAX: equivalent serial resistor of the crystal (up-
er limit, see crystal specification).
COSCOUT, COSCIN: maximum total capacitance on
OSCIN and OSCOUT, including the external ca-
pacitance plus the parasitic capacitance of the
board and the device.
Figure 12. External Clock Source Connections
Figure 13. Crystal/Ceramic Resonator
Figure 14. Clock Prescaler Block Diagram
RSMAX
40
60
150
COSCIN
56pF
47pF
22pF
COSCOUT
56pF
47pF
22pF
OSCIN
OSCOUT
EXTERNAL
CLOCK
NC
OSCIN
OSCOUT
COSCIN
COSCOUT
OSCIN
OSCOUT
COSCIN
COSCOUT
%2
% 16
fCPU
to CPU and
Peripherals
16
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PDF描述 |
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| ST72101G2M6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO28 |
| ST72212G2B6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST72101G2B3 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS |
| ST72101G2B3/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST72101G2B6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS |
| ST72101G2B6/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:MICROCONTROLLER|8-BIT|ST72 CPU|CMOS|SDIP|32PIN|PLASTIC |
| ST72101G2M1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS |
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