MG87FE52AP datasheet(13/44 Pages) MEGAWIN

13 / 44 page

Megawin Technology Co., Ltd.

MG87FE/L52

CKCON2 Register (0xBF)

Name

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

CKCON2

OSCDR

EN6TR

XCKS5

XCKS4

XCKS3

XCKS2

XCKS1

XCKS0

OSCDR

=0, the gain of crystal oscillator is enough for oscillation up to 48MHz.

=1, the gain of crystal oscillator is reduced. It will helpful in EMI reduction.

Regarding application not needing high frequency clock, it is recommended to do

so.

EN6TR

=0, MG87FE/L52 will run in 12T mode;

=1, MG87FE/L52 will run in 6T mode. It gets double performance than 12T.

The default value of this bit is load from Option Setting “EN6T”.

XCKS5~0

Set the crystal frequency value to define the time base of ISP/IAP programming.

Fill in the proper value according to XTAL1 as listed below.

XTAL1 @ 12T

XTAL1 @ 6T

XCKS5~0 setting

1MHz

0.5MHz

000000B

2MHz

1MHz

000001B

3MHz

1.5MHz

000010B

4MHz

2MHz

000011B

………..

45MHz

22.5MHz

101100B

46MHz

23MHz

101101B

47MHz

23.5MHz

101110B

48MHz

24MHz

101111B

The default value of XCKS=001010B for XTAL1=11MHz @ 12T.

Preliminary

ver 1.3

Date: 2009-JAN-20

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