SH79F6488PSLASH080PR datasheet(34/152 Pages) SINOWEALTH

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SH79F6488/SH79F6489

7.5 System Clock and Oscillator

7.5.1 Features

 Four oscillator types: 32.768kHz crystal, crystal oscillator, ceramic oscillator, 12MHz internal RC and PLL

 Built-in 12MHz Internal RC

 Built-in 32.768kHz speed up circuit

 Built-in system clock prescaler

7.5.2 Clock Definition

The SH79F6488/SH79F6489 have several internal clocks defined as below:

32KCRYCLK: the oscillator clock from XTAL 32.768kHz crystal oscillator. f32KCRY is defined as the 32KCRYCLK frequency.

t32KCRY is defined as the 32KCRYCLK period.

CRYCLK: the oscillator clock from XTAL or XTALX 400k-16MHz crystal oscillator, ceramic oscillato. fCRY is defined as the

CRYCLK frequency. tCRY is defined as the CRYCLK period.

HRCCLK: the oscillator clock from internal 12MHz RC. fHRC is defined as the HRCCLK frequency. tHRC is defined as the

HRCCLK period.

PLLCLK: the oscillator clock from PLL. fPLL is defined as the PLLCLK frequency. tPLL is defined as the PLLCLK period.

SCMCLK: the oscillator clock from internal 32kHz monitor RC. fSCM is defined as the SCMCLK frequency. tSCM is defined as the

SCMCLK period.

WDTCLK: the internal WDT RC clock. fWDT is defined as the WDTCLK frequency. tWDT is defined as the WDTCLK period.

OSC1CLK: the oscillator clock from one of the four oscillator types. fOSC is defined as the OSCCLK frequency. tOSC is defined as

the OSCCLK period.

OSC2CLK: the oscillator clock from one of the four oscillator types. fOSC2 is defined as the OSC2CLK frequency. tOSC2 is defined

as the OSC2CLK period.

Note:

(1) when code option OP_OSC = 0000, OSC1CLK is internal 12MHz RC,OSC2CLK is PLL (Refer to code option section for

details)

(2) when code option OP_OSC = 1010, OSC1CLK is 32.768kHz crystal oscillator, OSC2CLK is internal 12MHz RC (Refer to

code option section for details)

(3) when code option OP_OSC = 1010, OSC1CLK is 32.768kHz crystal oscillator, OSC2CLK is 400kHz-16Mhz crystal/ceramic

oscillator or PLL (Refer to code option section for details)

OSCSCLK: the input of system clock prescaler. It can be OSC1CLK or OSC2CLK. fOSCS is defined as the OSCSCLK

frequency. tOSCS is defined as the OSCSCLK period.

SYSCLK: system clock, the output of system clock prescaler. It is the CPU instruction clock. fSYS is defined as the SYSCLK

frequency. tSYS is defined as the SYSCLK period.

32.768k

crystal

12MHz

48MHz

PLL

WDT RC

/12

cpu

peripheral

device

SYSCLK

OSCSCLK

OSC1CLK

OSC2CLK

32KCRYCLK

PLLCLK

HRCCLK

CRYCLK

WDT

WDTCLK

OP_OSC[3:0]

FS,OSC2ON

CLKS[1:0]

SCMIF

SCMCLK

XTAL1

XTAL2

XTALX1

XTALX2

crystal

ceramic

SCMRC

PLLFS

SH79F6488P/080PR Datasheet(PDF) 34 Page - SINOWEALTH Electronic Ltd

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