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EM6605WW27 Datasheet(PDF) 8 Page - EM Microelectronic - MARIN SA |
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EM6605WW27 Datasheet(HTML) 8 Page - EM Microelectronic - MARIN SA |
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8 / 43 page  EM6605 03/01 REV. C/441 *Copyright 2002, EM Microelectronic-Marin SA 8 www.emmicroelectronic.com 4.Oscillator A built-in RC oscillator circuit generates the system operating clock ck[16] for the CPU and peripheral circuits with the help of an externally connected resistor (between RCin and Vss) which determins the frequency and a capacitor for better frequency stability (refer also to chapter 16.2). The oscillator circuit is supplied by the regulated voltage, Vreg. In SLEEP mode the oscillator is stopped. NOTE: Because the frequency can be selected by the user with an external resistor in a range from 30kHz - 130kHz (LF range) or 100kHz - 330kHz (HF range) (LF or HF range selected by metal option, refer to chapter 14) there is a table of corresponding frequencies for 3 different system clock frequencies. From now on besides each freq. name ck[x] there will be also an example for 32 768 Hz system clock marked by (*f1) to indicate first - lowest frequency. Table 6. Prescaler clock name definitions and frequency examples function Name frequency 1 (*f1) frequency 2 (*f2) frequency 3 (*f3) system clock ck[16] 32 768 Hz 131 072 Hz 327 680 Hz sys. clock / 2 ck[15] 16 348 Hz 65 536 Hz 163 480 Hz sys. clock / 4 ck[14] 8 192 Hz 32 768 Hz 81 920 Hz sys. clock / 8 ck[13] 4 096 Hz 16 348 Hz 40 960 Hz sys. clock / 16 ck[12] 2 048 Hz 8 192 Hz 20 480 Hz sys. clock / 32 ck[11] 1 024 Hz 4 096 Hz 10 240 Hz sys. clock / 64 ck[10] 512 Hz 2 048 Hz 5 120 Hz sys. clock / 128 ck[9] 256 Hz 1 024 Hz 2 560 Hz sys. clock / 256 ck[8] 128 Hz 512 Hz 1 280 Hz sys. clock / 512 ck[7] 64 Hz 256 Hz 640 Hz sys. clock / 1024 ck[6] 32 Hz 128 Hz 320 Hz sys. clock / 2048 ck[5] 16 Hz 64 Hz 160 Hz sys. clock / 4096 ck[4] 8 Hz 32 Hz 80 Hz sys. clock / 8192 ck[3] 4 Hz 16 Hz 40 Hz sys. clock / 16384 ck[2] 2 Hz 8 Hz 20 Hz sys. clock / 32768 ck[1] 1 Hz 4 Hz 10 Hz debouncer - long tdebL 16 msec 4 msec 1.6 msec debouncer - short tdebS 2 msec 0.5 msec 0.2 msec cold start delay tCoSt ~ 2 msec ~ 1 msec ~ 0.7 msec 1st buzzer freq. ck[buz1] 1 024 Hz 4 096 / *512 Hz 10 240/ *1 280 Hz 2nd buzzer freq. ck[buz2] 2 048 Hz 8 192 / *1 024 Hz 20 480/ *2 560 Hz 3rd buzzer freq. ck[buz3] 2 667 Hz 10 667 Hz 26 667 Hz buzzer frequencies for Hi frequency system clock have metal option 4.1.Prescaler The input to the prescaler is the system clock signal. The prescaler consists of a fifteen element divider chain which delivers clock signals for the peripheral circuits such as the timer/counter, buzzer, I/O debouncers and edge detectors, as well as generating prescaler interrupts. Table 7.Prescaler interrupt source Interrupt frequency PSF1 PSF0 mask(no interrupt) 0 0 ck[1] (1Hz *f1) 01 ck[4] (8Hz *f1) 10 ck[6] (32Hz *f1) 11 The frequency of prescaler interrupts is software selectable, as shown in Table 7 |
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