FM8PC71AM datasheet(29/73 Pages) FEELING

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FM8PC71AM

This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.

No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.

P.29

R1.1.004, Aug 7, 2017

FM8PC71AM

遠翔科技

Feeling Technology

【4】Clock Control

The MCU operation frequency rang is as following: ( Fcpu is MCU clock)

(1)

VDD > 2.0 V

Fcpu

≦

16Mhz

(Note: When MCU is Power on, the Fcpu is set 1/2/4/8 Mhz by configuration selection.

When MCU is after power on reset, the Fcpu can be switch to 16Mhz by program.)

Address 13H: Clock configuration (CLKCFG)

Bits

Name

SELCLK[2:0]

CLKSW

SIRCEN

INCODS

EXOSEN

IRCEN

Read/Write

R/W

Default

Bit[7:5] : SELCLK[2:0]

Select MCU switch-clock. (FIRC=16Mhz)

SELCLK[2:0]

Select clock(Fsel)

3’b000

(FOSC or FIRC)/1

3’b001

(FOSC or FIRC)/2

3’b010

(FOSC or FIRC)/4

3’b011

(FOSC or FIRC)/8

3’b100

(FOSC or FIRC)/16

3’b101

FSIRC

Bit[4] : CLKSW

CPU clock switch signal

1 = CPU clock start to switch from Ffig clock to Fsel clock.

0 = CPU clock start to switch from Fsel clock to Ffig clock.

Note: If ATSW bit is ‘1’, and LVDTA bit is ‘0’, the CPU clock will be forced to Ffig.

Bit[3] : SIRCEN

Slow IRC Enable

1 = Enable SIRC.

0 = Disable SIRC.

Bit[2] : INCODS

Internal clock output disable.

1 = Disable internal IRC clock output.

0 = Enable internal IRC clock output. The IRC clock is driven output to XOUT pin.

Bit[1] : EXOSEN

External Oscillator Enable.

1 = Enable the external oscillator. The Fcpu clock is switch to external clock(Fosc) from FIRC clock.

0 = Disable Oscillator Enable.

Bit[0] : IRCEN

Internal clock enable.

1 = Enable internal clock

0 = Disable internal clock.

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