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EM6812F2TP24B Datasheet(PDF) 29 Page - EM Microelectronic - MARIN SA |
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EM6812F2TP24B Datasheet(HTML) 29 Page - EM Microelectronic - MARIN SA |
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29 / 81 page  R EM6812 Copyright © 2005, EM Microelectronic-Marin SA 29 www.emmicroelectronic.com 8.6.1 Prescaler2 (10 stages) The prescaler 2 has two selectable clock sources possible. By default it is running on RC oscillator. • Pr2CkSe l = ‘0’: LF clock domain (F1: Xtal oscillator or external clock). • Pr2CkSel = ‘1’: HF clock domain after pre-division (F2) divided by 2 (RC oscillator or external clock) F2/2. Pr2CkSource is the clock source of the prescaler2. 10 different clocks get out from the prescaler2; Pr2Ck[9:0]. The shaded values are selected for prescaler1 clock input in case of autoselect and no active low frequency. All clock duty cyles are 50% expecpt for the Pr2CkSource which is 25% high if issued from the high frequency input clock. Table 20. Prescaler2 output frequencies when running on HF clock domain (CkPeri_High_Freq) RC Oscillator 10MHz 10MHz 10MHz 10MHz 1MHz 1MHz 1MHz 1MHz Pre-Division by 1 2 4 8 1 2 4 8 Pr2CkSource (Duty: 25% high) F2/2 5MHz F2/2 2.5MHz F2/2 1.25MHz F2/2 625kHz F2/2 500kHz F2/2 250kHz F2/2 125kHz F2/2 62.5kHz Pr2Ck[9] Pr2CkSource / 2 2.5MHz 1.25MHz 625kHz 313kHz 250kHz 125kHz 62.5kHz 31.3kHz Pr2Ck[8] Pr2CkSource / 4 1.25MHz 625kHz 313kHz 156kHz 125kHz 62.5kHz 31.3kHz 15.6kHz Pr2Ck[7] Pr2CkSource / 8 625kHz 313kHz 156kHz 78kHz 62.5kHz 31.3kHz 15.6kHz 7.8kHz Pr2Ck[6] Pr2CkSource / 16 313kHz 156kHz 78kHz 39kHz 31.3kHz 15.6kHz 7.8kHz 3.9kHz Pr2Ck[5] Pr2CkSource / 32 156kHz 78kHz 39kHz 20kHz 15.6kHz 7.8kHz 3.9kHz 2.0kHz Pr2Ck[4] Pr2CkSource / 64 78kHz 39kHz 20kHz 10kHz 7.8kHz 3.9kHz 2.0kHz 1.0kHz Pr2Ck[3] Pr2CkSource / 128 39kHz 20kHz 10kHz 5kHz 3.9kHz 2.0kHz 1.0kHz 500Hz Pr2Ck[2] Pr2CkSource / 256 20kHz 10kHz 5kHz 2.4kHz 2.0kHz 1.0kHz 500Hz 250Hz Pr2Ck[1] Pr2CkSource / 512 10kHz 5kHz 2.4kHz 1.2kHz 1.0kHz 500Hz 250Hz 125Hz Pr2Ck[0] Pr2CkSource / 1024 5kHz 2.4kHz 1.2kHz 610Hz 500Hz 250Hz 125Hz 62Hz The prescaler2 clock values, 8 MSB's, Pr2CkStatus[7:0] can be read in register RegPr2Status. These 8 most significative bits can be cleared by a simple write operation of any value to the RegPr2Status register. The Pr2Ck sources are used as input clock sources for several other peripheries (SPI, Timers, Prescaler1, etc). Clearing the 8 MSB’s may therefore influence the proper operation of these peripheries. Table 21. Prescaler2 output frequencies when running on LF clock domain (CkPeri_Low_Freq) Signal name Division Presacler 2 output frequency In case of XTAL 32kHz as active low frequency clock Pr2CkSource Pr2CkSource / 1 32768Hz Pr2Ck[9] Pr2CkSource / 2 16384Hz Pr2Ck[8] Pr2CkSource / 4 8192Hz Pr2Ck[7] Pr2CkSource / 8 4096Hz Pr2Ck[6] Pr2CkSource / 16 2048Hz Pr2Ck[5] Pr2CkSource / 32 1024Hz Pr2Ck[4] Pr2CkSource / 64 512Hz Pr2Ck[3] Pr2CkSource / 128 256Hz Pr2Ck[2] Pr2CkSource / 256 128Hz Pr2Ck[1] Pr2CkSource / 512 64Hz Pr2Ck[0] Pr2CkSource / 1024 32Hz |
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