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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST10F269Z2QX датащи(PDF) 101 Page - STMicroelectronics |
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ST10F269Z2QX датащи(HTML) 101 Page - STMicroelectronics |
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101 / 161 page  ST10F269Z2Qx 101/161 16.1.2 - RTCPH & RTCPL: RTC PRESCALER Registers The 20-bit programmable prescaler divider is loaded with 2 registers. The 4 most significant bit are stored into RTCPH and the 16 Less significant bit are stored in RTCPL. In order to keep the system clock, those registers are not reset. They are write protected by bit RTOFF of RTCCON register, write operation is allowed if RTOFF is set. RTCPL (EC06h) XBUS Reset Value: XXXXh RTCPH (EC08h) XBUS Reset Value: ---Xh The value stored into RTCPH, RTCPL is called RTCP (coded on 20-bit). The dividing ratio of the Prescaler divider is: ratio = 64 x (RTCP) 16.1.3 - RTCDH & RTCDL: RTC DIVIDER Counters Every basic reference clock the DIVIDER counters are reloaded with the value stored RTCPH and RTCPL registers. To get an accurate time measurement it is possible to read the value of the DIVIDER, reading the RTCDH, RTCDL. Those counters are read only. After any bit changed in the programmable PRESCALER register, the new value is loaded in the DIVIDER. RTCDL (EC0Ah) XBUS Reset Value: XXXXh RTCDH (EC0Ch) XBUS Reset Value: ---Xh Note: Those registers are not reset, and are read only. 15 14 13 12 11 10 987654 3210 RTCPL RW 15 14 13 12 11 10 987654 3210 RESERVED RTCPH RW Figure 52 : PRESCALER Register 15 14 13 12 11 10 987654 3210 RTCDL R 15 14 13 12 11 10 987654 3210 RESERVED RTCDH R 3 2 1 0 7 6 5 4 11 10 9 8 15 14 13 12 3 2 1 0 RTCPH RTCPL 3 2 1 0 7 6 5 4 11 10 9 8 15 14 13 12 19 18 17 16 20 bit word counter |
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