ST7FOXU0 datasheet(29/123 Pages) STMICROELECTRONICS

29 / 123 page

ST7FOXU0

Supply, reset and clock management

29/123

Figure 10.

ST7FOXU0 clock management block diagram

6.2

Multi-oscillator (MO)

The main clock of the ST7 can be generated by four different source types coming from the

multi-oscillator block (1 to 16 MHz):

●

An external source

●

An internal high frequency RC oscillator

6.2.1

External clock source

In this external clock mode, a clock signal (square, sinus or triangle) with ~50% duty cycle

has to drive CLKIN.

MCCSR

SMS

PERIPHERALS

(1ms timebase @ 8 MHz fOSC)

fOSC/32

fOSC

fLTIMER

LITE TIMER COUNTER

13-BIT

fCPU

TO CPU AND

CR6

CR9

CR2

CR3

CR4

CR5

CR8

CR7

RCCRH

fOSC

CLKIN

Tunable

Oscillator

internal RC

Option bits

CKSEL[1:0]

DIVIDER

AWU

8 MHz

2 MHz

1 MHz

4 MHz

Prescaler

8MHz(fRC)

33kHz

Clock

Controller

Ext Clock

AWU CK

RC OSC

CR1

CR0

RCCRL

/32 DIVIDER

fCLKIN

CKCNTCSR

RC/AWU

500 kHz

MCO

PSCR

CK2

CK1

CK0

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