參數(shù)資料
型號： ST10F168-Q3
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP144
封裝： 28 X 28 MM, PLASTIC, QFP-144
文件頁數(shù)： 50/74頁
文件大?。?/td> 479K
代理商： ST10F168-Q3
ST10F168
54/74
20.5.2 - Definition of Internal Timing
The internal operation of the ST10F168 is
controlled by the internal CPU clock fCPU. Both
edges of the CPU clock can trigger internal (e.g.
pipeline) or external (e.g. bus cycles) operations.
The specification of the external timing (AC
Characteristics) therefore depends on the time
between two consecutive edges of the CPU clock,
called “TCL” (see Figure 18).
The CPU clock signal can be generated by
different mechanisms. The duration of TCL and its
variation (and also the derived external timing)
depends on the mechanism used to generate
fCPU. This influence must be regarded when
calculating the timings for the ST10F168.
The example for PLL operation shown in the
Figure 18 refers to a PLL factor of 4.
The mechanism used to generate the CPU clock
is selected during reset by the logic levels on pins
P0.15-13 (P0H.7-5).
20.5.3 - Clock Generation Modes
The Table 23 associates the combinations of these three bit with the respective clock generation mode.
Notes: 1. The external clock input range refers to a CPU clock range of 1...25MHz.
2. The maximum depends on the duty cycle of the external clock signal.
3. The maximum input frequency is 25MHz when using an external crystal with the internal oscillator; providing that internal serial
resistance of the crystal is less than 40
. However, higher frequencies can be applied with an external clock source on pin XTAL1,
but in this case, the input clock signal must reach the defined levels VIL and VIH2.
Figure 18 : Generation Mechanisms for the CPU Clock
Table 23 : CPU Frequency Generation
P0H.7 P0H.6 P0H.5 CPU Frequency fCPU =fXTAL x F External Clock Input Range
1
Notes
111
fXTAL x 4
2.5 to 6.25MHz
Default configuration
110
f
XTAL x 3
3.33 to 8.33MHz
101
fXTAL x 2
5 to 12.5MHz
100
f
XTAL x 5
2 to 5MHz
011
fXTAL x 1
1 to 25MHz
Direct drive 2
010
fXTAL x 1.5
6.66 to 16.6MHz
001
fXTAL / 2
2 to 50MHz
CPU clock via prescaler 3
000
fXTAL x 2.5
4 to 10MHz
TCL TCL
fCPU
fXTAL
fCPU
fXTAL
Phase locked loop operation
Direct Clock Drive
TCL
fCPU
fXTAL
Prescaler Operation
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ST10F267-DT 制造商:STMicroelectronics 功能描述:
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