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EM6812F2TP24B 数据表(PDF) 31 Page - EM Microelectronic - MARIN SA |
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EM6812F2TP24B 数据表(HTML) 31 Page - EM Microelectronic - MARIN SA |
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31 / 81 page  R EM6812 Copyright © 2005, EM Microelectronic-Marin SA 31 www.emmicroelectronic.com Table 24. Prescaler1 output clock frequencies based on selected input clock source. XTAL Pr2Source AutoSelect RC 10MHz Pre-Div. 1 RC Clock Pre-Division 1 to 8 RC 1 MHz Pre-Div. 8 Xtal 32kHz Pr1CkSource origin F1, Xtal F2 based F2 (10MHz) Highest value F2:12 intermediate values from F2 (125kHz) Lowest value Xtal from Pr2 Pr1CkSource frequency F1 32kHz Pr2cK auto ~32kHz Pr2ck[9] 2.5MHz Pr2ck[9:3] 1.25Mhz and 500Hz Pr2Ck[3] 500Hz Pr2Ck[3] 256Hz Pr1Ck[14] / 2 16kHz ~16kHz 1.25MHz 625KHz to 500Hz 250Hz 128Hz Pr1Ck[13] / 4 8kHz ~8kHz 625kHz 313kHz to 250Hz 125Hz 64Hz Pr1Ck[12] / 8 4kHz ~4kHz 313kHz 156kHz to 125Hz 62Hz 32Hz Pr1Ck[11] / 16 2kHz ~2kHz 156kHz 78kHz to 62Hz 31Hz 16Hz Pr1Ck[10] / 32 1kHz ~1kHz 78kHz 39kHz to 31Hz 16Hz 8Hz Pr1Ck[9] / 64 512Hz ~512Hz 39kHz 20kHz to 16Hz 8Hz 4Hz Pr1Ck[8] / 128 256Hz ~256Hz 20kHz 10kHz to 8Hz 4Hz 2Hz Pr1Ck[7] / 256 128Hz ~128Hz 10kHz 5kHz to 4Hz 2Hz 1Hz Pr1Ck[6] / 512 64Hz ~64Hz 5kHz 2.4kHz to 2Hz 1Hz 0.5Hz (2s) Pr1Ck[5] / 1024 32Hz ~32Hz 2.4kHz 1.2kHz to 1Hz 0.5Hz (2s) 0.25Hz (4s) Pr1Ck[4] / 2048 16Hz ~16Hz 1.2kHz 600Hz to 0.5Hz 0.25Hz (4s) 0.125Hz (8s) Pr1Ck[3] / 4096 8Hz ~8Hz 600Hz 300Hz to 0.25Hz 0.125Hz (8s) 0.062Hz (16s) Pr1Ck[2] / 8192 4Hz ~4Hz 300Hz 150Hz to 0.125Hz 0.062Hz (16s) 0.031Hz (32s) Pr1Ck[1] / 16384 2Hz ~2Hz 150Hz 75Hz to 0.062Hz 0.031Hz (32s) 0.016Hz (64s) Pr1Ck[0] / 32768 1Hz ~1Hz 75Hz 38Hz to 0.031Hz 0.016Hz (64s) 0.008Hz (128s) 8.7 RC clock trimming with Xtal oscillator The RC oscillator can be trimmed to a precise frequency using either internal 32kHz Xtal based frequencies or any other known timing as a reference. The base frequencies of the RC oscillator are trimmable to typ ± 40%, combining the trimming and the frequency divider gives a total of 8 overlapping frequency regions with each 256 possible frequencies. See also Figure 16. The frequency precision within the 75kHz to 10MHz range is better than 0.5%. Repeating the frequency adjustment regularly allows compensating for slow voltage and temperature changes. The trim value can be obtained by successive approximation using the timer to count the RC clock during a given timing period (i.e. prescaler interrupts), then change the trim value based on the timer result until the result is within the desired precision window. See also the Application note for RC trimming. |
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