ST10F280_12 datasheet(211/239 Pages) STMICROELECTRONICS

Part #	ST10F280

Description	16-bit MCU with MAC unit, 512 Kbyte Flash memory and 18 Kbyte RAM

PDF	239 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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ST10F280

Electrical characteristics

Doc ID 8673 Rev. 3

211/239

The mechanism used to generate the CPU clock is selected during reset by the logic levels

on pins P0.15-13 (P0H.7-5).

Figure 77.

Generation mechanisms for the CPU clock

20.4.3

Clock generation modes

The Table 45 associates the combinations of these three bit with the respective clock

generation mode.

Table 45.

CPU frequency generation

P0H.7 P0H.6

P0H.5

CPU frequency

fCPU = fXTAL x F

External clock input

range(1)

Notes

XTAL x 4

2.5 to 10MHz

Default configuration

XTAL x 3

3.33 to 13.33MHz

XTAL x 2

5 to 20MHz

XTAL x 5

2 to 8MHz

XTAL x 1

1 to 40MHz

Direct drive(2)(3)

XTAL x 10

1 to 4MHz

XTAL x 0.5

2 to 80MHz

CPU clock via

prescaler(4)

XTAL x 2.5

4 to 16MHz

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

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

The PLL free-running frequency is from 2 to 10MHz.

ST10F280 Datasheet(PDF) 211 Page - STMicroelectronics

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