Connection Of An Oscillator Or An External Clock To The Microcontroller - Fujitsu MB96300 series Hardware Manual

F2mc-16fx 16-bit

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Connection of an Oscillator or an External Clock to the

Microcontroller

The F2MC-16FX microcontroller contains up to two clock generation circuits for external

oscillators, the Main oscillation circuit and the Sub oscillation circuit. Connecting an

external oscillator to these circuits generates the Main clock and the Sub clock.

Alternatively, externally generated clocks can be input to the micro controller.

■ Example of connecting a crystal or ceramic oscillator to the microcontroller

Connect a crystal or ceramic oscillator as shown in the following diagram.

Figure 6.6-1 Example of Connecting a Crystal or Ceramic Oscillator to the Microcontroller

If this connection is used on devices, where the Fast Clock Input feature is available, the CILCR:FCI bit

must be set to "0". For information about the availability of this feature, please refer to the datasheet.

■ Example of connecting an external clock to the microcontroller

As shown in the example in Figure 6.6-2"Example of Connecting an External Clock to the

Microcontroller", connect an external clock to pin X0 (X0A). Pin X1 (X1A) must be open.

For devices with the optional Fast Clock Input feature, it is possible to use a high speed clock frequency for

the X0 pin (please consult the datasheet for the actual limits of the clock input frequency and the

availability of the Fast Clock Input feature). This feature is activated by setting the CILCR:FCI bit to '1'

before switching the device to the external Main clock.

Fujitsu recommends to always use the Fast Clock Input feature when connecting an external clock to the

Main oscillator.

F2MC-16FX MCU

CHAPTER 6 CLOCKS