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WM8321 数据表(PDF) 105 Page - Wolfson Microelectronics plc |
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WM8321 数据表(HTML) 105 Page - Wolfson Microelectronics plc |
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105 / 253 page  Production Data WM8321 w PD, February 2012, Rev 4.0 105 ADDRESS BIT LABEL DEFAULT DESCRIPTION R16416 (4020h) RTC Write Counter 15:0 RTC_WR_CNT 0000h RTC Write Counter. This random number is updated on every write to the RTC_TIME registers. R16417 (4021h) RTC Time 1 15:0 RTC_TIME [31:16] 0000h RTC Seconds counter (MSW) RTC_TIME increments by 1 every second. This is the 16 MSBs. R16418 (4022h) RTC Time 2 15:0 RTC_TIME [15:0] 0000h RTC Seconds counter (LSW) RTC_TIME increments by 1 every second. This is the 16 LSBs. R16419 (4023h) RTC Alarm 1 15:0 RTC_ALM [31:16] 0000h RTC Alarm time (MSW) 16 MSBs of RTC_ALM R16420 (4024h) RTC Alarm 2 15:0 RTC_ALM [15:0] 0000h RTC Alarm time (LSW) 16 LSBs of RTC_ALM R16421 (4025h) RTC Control 15 RTC_VALID 0 RTC Valid status 0 = RTC_TIME has not been set since Power On Reset 1 = RTC_TIME has been written to since Power On Reset 14 RTC_SYNC_BUS Y 0 RTC Busy status 0 = Normal 1 = Busy The RTC registers should not be written to when RTC_SYNC_BUSY = 1. 10 RTC_ALM_ENA 0 RTC Alarm Enable 0 = Disabled 1 = Enabled R16422 (4026h) RTC Trim 9:0 RTC_TRIM 000h RTC frequency trim. Value is a 10bit fixed point <4,6> 2’s complement number. MSB Scaling = -8Hz. The register indicates the error (in Hz) with respect to the ideal 32768Hz) of the input crystal frequency. Protected by user key Table 49 Real Time Clock (RTC) Control |
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