ST10F269ZX datasheet(148/184 Pages) STMICROELECTRONICS

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ST10F269

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21.4.3 - Clock Generation Modes

The Table 44 associates the combinations of these three bits with the respective clock generation mode.

Notes: 1. The external clock input range refers to a CPU clock range of 1...40MHz.

2. The maximum input frequency 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

Ω. 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..

Notes: 1. The external clock input range refers to a CPU clock range of 1...32MHz.

2. The maximum input frequency depends on the duty cycle of the external clock signal.

3. The maximum input frequency is 32MHz when using an external crystal with the internal oscillator; providing that internal serial

resistance of the crystal is less than 40

Ω. 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..

Table 44 : CPU Frequency Generation (PQFP144 devices)

P0H.7 P0H.6 P0H.5 CPU Frequency fCPU = fXTAL x F External Clock Input Range1

Notes

fXTAL x 4

2.5 to 10MHz

Default configuration

fXTAL x 3

3.33 to 13.33MHz

fXTAL x 2

5 to 20MHz

fXTAL x 5

2 to 8MHz

fXTAL x 1

1 to 40MHz

Direct drive2

fXTAL x 1.5

6.66 to 26.66MHz

fXTAL x 0.5

2 to 80MHz

CPU clock via prescaler3

fXTAL x 2.5

4 to 16MHz

Table 45 : CPU Frequency Generation (TQFP144 devices)

P0H.7 P0H.6 P0H.5 CPU Frequency fCPU = fXTAL x F External Clock Input Range1

Notes

fXTAL x 4

2.5 to 8MHz

Default configuration

fXTAL x 3

3.33 to 10.67MHz

fXTAL x 2

5 to 16MHz

fXTAL x 5

2 to 6.4MHz

fXTAL x 1

1 to 32MHz

Direct drive2

fXTAL x 1.5

6.67 to 21.33MHz

fXTAL x 0.5

2 to 64MHz

CPU clock via prescaler3

fXTAL x 2.5

4 to 12.8MHz

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