參數(shù)資料
型號(hào): ST10F168-Q2
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(yè)數(shù): 52/76頁(yè)
文件大小: 483K
代理商: ST10F168-Q2
ST10F168
56/76
Figure 18 : Generation Mechanisms for the CPU Clock
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, but in this case,
the input clock signal must reach the defined levels VIL and VIH2.
Table 23 : CPU Frequency Generation
P0H.7 P0H.6 P0H.5 CPU Frequency fCPU =fXTAL xF External Clock Input Range1
Notes
11
1
FXTAL x4
2.5 to 6.25MHz
Default configuration
11
0
FXTAL x3
3.33 to 8.33MHz
10
1
FXTAL x2
5 to 12.5MHz
10
0
FXTAL x5
2 to 5MHz
01
1
F
XTAL x1
1 to 25MHz
Direct drive2
01
0
F
XTAL x 1.5
6.66 to 16.6MHz
00
1
FXTAL /2
2 to 50MHz
CPU clock via prescaler3
00
0
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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