ST7DALIF2 datasheet(35/171 Pages) STMICROELECTRONICS

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ST7DALIF2

Supply, reset and clock management

35/171

9.4.2

RC control register (RCCR)

Read / Write

Reset Value: 1111 1111 (FFh)

Bits 7:0 = CR[7:0] RC Oscillator Frequency Adjustment Bits

These bits must be written immediately after reset to adjust the RC oscillator frequency and

to obtain an accuracy of 1%. The application can store the correct value for each voltage

range in EEPROM and write it to this register at start-up.

00h = maximum available frequency

FFh = lowest available frequency

Note:

To tune the oscillator, write a series of different values in the register until the correct

frequency is reached. The fastest method is to use a dichotomy starting with 80h.

Figure 12.

Clock management block diagram

CR70

CR60

CR50

CR40

CR30

CR20

CR10

CR4

CR7

CR0

CR1

CR2

CR3

CR6

CR5

RCCR

fOSC2

MCCSR

SMS

MCO

fCPU

TO CPU AND

PERIPHERALS

(1ms timebase @ 8 MHz fOSC2)

/32 DIVIDER

fOSC2

fOSC2/32

fOSC2

fLTIMER

LITE TIMER 2 COUNTER

8-BIT

AT TIMER 2

12-BIT

PLL

8MHz -> 32MHz

fCPU

CLKIN

OSC2

CLKIN

Tunable

Oscillator

1% RC

PLL 1MHz -> 8MHz

PLL 1MHz -> 4MHz

RC OSC

PLLx4x8

DIVIDER

Option bits

OSC,PLLOFF,

OSCRANGE[2:0]

OSC

1-16 MHZ

or 32kHz

CLKIN

/OSC1

fOSC

DIVIDER

OSC/2

CLKIN/2

Option bits

OSC,PLLOFF,

OSCRANGE[2:0]

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