NXP Semiconductors LPC43 Series User Manual

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NXP Semiconductors LPC43 Series User Manual Manual pdf 935 page image

UM10503 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.User manual Rev. 1.3 — 6 July 2012 935 of 1269NXP Semiconductors UM10503Chapter 35: LPC43xx Real-Time Clock (RTC)[1] This register value is not changed by reset.35.6.7 Alarm register groupThe alarm registers are shown in Table 802. The values in these registers are comparedwith the time counters. If all the unmasked (See Section 35.6.4 “Alarm Mask Register” onpage 930) alarm registers match their corresponding time counters then an interrupt isgenerated. The interrupt is cleared when a 1 is written to bit 1 of the Interrupt LocationRegister (ILR[1]).[1] This register value is not changed by reset.[1] This register value is not changed by reset.17 CALDIR Calibration direction - [1]0 Forward calibration. When CALVAL is equal to thecalibration counter, the RTC timers will jump by 2 seconds.1 Backward calibration. When CALVAL is equal to thecalibration counter, the RTC timers will stop incrementing for1 second.31:18 - Reserved, user software should not write ones to reservedbits. The value read from a reserved bit is not defined.-Table 801. Calibration register (CALIBRATION - address 0x4004 6040) bit descriptionBit Symbol Value Description ResetvalueTable 802. Alarm registersName Size Description Access AddressALSEC 6 Alarm value for Seconds R/W 0x4004 6060ALMIN 6 Alarm value for Minutes R/W 0x4004 6064ALHRS 5 Alarm value for Hours R/W 0x4004 6068ALDOM 5 Alarm value for Day of Month R/W 0x4004 606CALDOW 3 Alarm value for Day of Week R/W 0x4004 6070ALDOY 9 Alarm value for Day of Year R/W 0x4004 6074ALMON 4 Alarm value for Months R/W 0x4004 6078ALYEAR 12 Alarm value for Years R/W 0x4004 607CTable 803. Alarm Seconds register (ASEC - address 0x4004 6060) bit descriptionBit Symbol Description Resetvalue5:0 SECONDS Seconds value in the range of 0 to 59 - [1]31:6 - Reserved, user software should not write ones to reserved bits.The value read from a reserved bit is not defined.-Table 804. Alarm Minutes register (AMIN - address 0x4004 6064) bit descriptionBit Symbol Description Resetvalue5:0 MINUTES Minutes value in the range of 0 to 59 - [1]31:6 - Reserved, user software should not write ones to reserved bits.The value read from a reserved bit is not defined.-