C68HC11KA4BCFU4 查看數據表（PDF） - Motorola => Freescale

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C68HC11KA4BCFU4

8-Bit Microcontroller

Motorola => Freescale 

XDV[1:0] — XOUT Clock Divide Select

These two bits control the frequency of the clock that is driven out the XOUT pin. The CLKX bit in the

CONFIG register controls whether this clock is on or off. When a clock rate is selected, allow a maxi-

mum of 16 cycles for stabilization. During reset a frequency of EXTAL is output. This frequency can be

divided after reset. Note that the phase relationship between the 4XDV1 signal and both EXTAL and E

cannot be predicted. Refer to the following table for further information about XOUT frequencies.

XDV[1:0]

0

0

0

1

1

0

1

1

XDV[1:0]

0

0

0

1

1

0

1

1

EXTAL

Divided By

1

4

6

8

EXTAL

Divided By

1

4

6

8

Table 5 XOUT Frequencies

Frequency at

EXTAL = 8 MHz

8 MHz

2 MHz

1.33 MHz

1 MHz

Frequency at

EXTAL = 8.4 MHz

8.4 MHz

2.1 MHz

1.4 MHz

1.05 MHz

Frequency at

EXTAL = 12 MHz

12 MHz

3 MHz

2 MHz

1.5 MHz

Frequency at

EXTAL = 12.6 MHz

12.6 MHz

3.15 MHz

2.1 MHz

1.57 MHz

Frequency at

EXTAL = 16 MHz

16 MHz

4 MHz

2.7 MHz

2 MHz

Frequency at

EXTAL = 16.8 MHz

16.8 MHz

4.2 MHz

2.8 MHz

2.1 MHz

NOTE

The XOUT pin is not bonded in the 64-pin package.

MOTOROLA

20

MC68HC11KA4

MC68HC11KA4TS/D

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