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PCF8523T/1 数据表(PDF) 34 Page - NXP Semiconductors |
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PCF8523T/1 数据表(HTML) 34 Page - NXP Semiconductors |
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34 / 75 page  PCF8523 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 4 — 5 July 2012 34 of 74 NXP Semiconductors PCF8523 Real-Time Clock (RTC) and calendar 8.9.1.4 Register Tmr_A_reg 8.9.1.5 Register Tmr_B_freq_ctrl [1] Default value. 8.9.1.6 Register Tmr_B_reg Table 37. Tmr_A_reg - timer A value register (address 11h) bit description Bit Symbol Value Description 7 to 0 TIMER_A_VALUE[7:0] 00 to FF timer-period in seconds where n is the countdown value timerperiod n sourceclockfrequency ----------------------------------------------------------- = Table 38. Tmr_B_freq_ctrl - timer B frequency control register (address 12h) bit description Bit Symbol Value Description 7 - - unused 6 to 4 TBW[2:0] low pulse width for pulsed timer B interrupt 000[1] 46.875 ms 001 62.500 ms 010 78.125 ms 011 93.750 ms 100 125.000 ms 101 156.250 ms 110 187.500 ms 111 218.750 ms 3 - - unused 2 to 0 TBQ[2:0] source clock for timer B (see Table 40) 000 4.096 kHz 001 64 Hz 010 1 Hz 011 1⁄60 Hz 111[1] 110 100 1⁄3600 Hz Table 39. Tmr_B_reg - timer B value register (address 13h) bit description Bit Symbol Value Description 7 to 0 TIMER_B_VALUE[7:0] 00 to FF timer-period in seconds where n is the countdown value timerperiod n sourceclockfrequency ----------------------------------------------------------- = |
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