56F807 datasheet(31/60 Pages) FREESCALE

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External Clock Operation

56F807 Technical Data Technical Data, Rev. 16

Freescale Semiconductor

3.4.3

External Clock Source

The recommended method of connecting an external clock is given in Figure 3-9. The external clock

source is connected to XTAL and the EXTAL pin is grounded.

Figure 3-9 Connecting an External Clock Signal

Figure 3-10 External Clock Timing

Table 3-8 External Clock Operation Timing Requirements5

Operating Conditions: V

SS = VSSA = 0 V, VDD = VDDA = 3.0–3.6 V, TA = –40° to +85°C

Characteristic

Symbol

Min

Typ

Max

Unit

Frequency of operation (external clock driver)1

See Figure 3-9 for details on using the recommended connection of an external clock driver.

fosc

0—

MHz

Clock Pulse Width2, 3

The high or low pulse width must be no smaller than 6.25ns or the chip will not function. However, the high pulse width

does not have to be any particular percent of the low pulse width.

Parameters listed are guaranteed by design.

tPW

6.25

—

56F807

XTAL

EXTAL

External

VSS

Clock

External

Clock

VIH

VIL

Note: The midpoint is VIL + (VIH – VIL)/2.

90%

50%

10%

90%

50%

10%

tPW

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