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参数资料
型号： ST72T212G2M6
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PDSO28
封装： 0.300 INCH, PLASTIC, SOIC-28
文件页数： 7/78页
文件大小： 1214K
代理商： ST72T212G2M6
15/78
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)isde-
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 12 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.
RP: external shunt resistor. Recommended value
for oscillator stability is 1M
.
Figure 11. External Clock Source Connections
Figure 12. Crystal/Ceramic Resonator
Figure 13. Clock Prescaler Block Diagram
RSMAX
40
60
150
COSCIN
56pF
47pF
22pF
COSCOUT
56pF
47pF
22pF
RP
1-10 M
1-10 M
1-10 M
OSCIN
OSCOUT
EXTERNAL
CLOCK
NC
OSCIN
OSCOUT
COSCIN
COSCOUT
RP
OSCIN
OSCOUT
COSCIN
COSCOUT
RP
%2
%16
fCPU
to CPU and
Peripherals
15
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相关代理商/技术参数
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ST72T213G1B6 功能描述:8位微控制器 -MCU OTP EPROM 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72T213G1M6 功能描述:8位微控制器 -MCU OTP EPROM 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72T251G1B6 功能描述:8位微控制器 -MCU OTP EPROM 4K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72T251G1M6 功能描述:8位微控制器 -MCU RO 511-ST72C254G1M6 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72T251G2B6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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