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ST10F296 数据表(PDF) 206 Page - STMicroelectronics |
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ST10F296 数据表(HTML) 206 Page - STMicroelectronics |
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206 / 346 page ![]() Obsolete Product(s) - Obsolete Product(s) Real-time clock (RTC) ST10F296E 206/346 RTC prescaler registers (RTCPH and RTCPL) The 20-bit programmable prescaler divider is loaded with two registers: The RTC prescaler high (RTCPH) and RTC prescaler low (RTCPL). The four most significant bits are stored in the RTCPH and the 16 least significant bits are stored in the RTCPL. To maintain the system clock, these registers are not reset. They are write protected by the RTCOFF bit of the RTCCON register. Write operation is allowed when RTCOFF is set. Note: Bits 15 to 4 of the RTCPH are not used. When reading this register, the return value of these bit is zero. Figure 73. Prescaler registers The value stored in RTCPH and RTCPL is called RTCP (coded on 20-bit). The dividing ratio of the prescaler divider is: 64 x (RTCP). RTCPH (ED08h) XBus Reset value: ---Xh 15 14 13 12 11 10 987 65432 10 Reserved RTCPH -RW RTCPL (ED06h) XBus Reset value: XXXXh 15 14 13 12 11 10 987 65432 10 RTCPL RW 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 Obsolete Product(s) - Obsolete Product(s) |
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