UM10139

Philips SemiconductorsVolume 1UM10139Chapter 19: RTC19.4 Register descriptionThe RTC includes a number of registers. The address space is split into four sections byfunctionality. The first eight addresses are the Miscellaneous Register Group(Section 19.4.2). The second set of eight locations are the Time Counter Group(Section 19.4.12). The third set of eight locations contain the Alarm Register Group(Section 19.4.14). The remaining registers control the Reference Clock Divider.The Real Time Clock includes the register shown in Table 263. Detailed descriptions ofthe registers follow.Table 263: Real Time Clock (RTC) register mapName Size Description Access Reset Addressvalue [1]ILR 2 Interrupt Location Register R/W * 0xE002 4000CTC 15 Clock Tick Counter RO * 0xE002 4004CCR 4 Clock Control Register R/W * 0xE002 4008CIIR 8 Counter Increment Interrupt Register R/W * 0xE002 400CAMR 8 Alarm Mask Register R/W * 0xE002 4010CTIME0 32 Consolidated Time Register 0 RO * 0xE002 4014CTIME1 32 Consolidated Time Register 1 RO * 0xE002 4018CTIME2 32 Consolidated Time Register 2 RO * 0xE002 401CSEC 6 Seconds Counter R/W * 0xE002 4020MIN 6 Minutes Register R/W * 0xE002 4024HOUR 5 Hours Register R/W * 0xE002 4028DOM 5 Day of Month Register R/W * 0xE002 402CDOW 3 Day of Week Register R/W * 0xE002 4030DOY 9 Day of Year Register R/W * 0xE002 4034MONTH 4 Months Register R/W * 0xE002 4038YEAR 12 Years Register R/W * 0xE002 403CALSEC 6 Alarm value for Seconds R/W * 0xE002 4060ALMIN 6 Alarm value for Minutes R/W * 0xE002 4064ALHOUR 5 Alarm value for Seconds R/W * 0xE002 4068ALDOM 5 Alarm value for Day of Month R/W * 0xE002 406CALDOW 3 Alarm value for Day of Week R/W * 0xE002 4070ALDOY 9 Alarm value for Day of Year R/W * 0xE002 4074ALMON 4 Alarm value for Months R/W * 0xE002 4078ALYEAR 12 Alarm value for Year R/W * 0xE002 407CPREINT 13 Prescaler value, integer portion R/W 0 0xE002 4080PREFRAC 15 Prescaler value, integer portion R/W 0 0xE002 4084[1] Registers in the RTC other than those that are part of the Prescaler are not affected by chip Reset. Theseregisters must be initialized by software if the RTC is enabled. Reset value reflects the data stored in usedbits only. It does not include reserved bits content.© Koninklijke Philips Electronics N.V. 2005. All rights reserved.User manual Rev. 01 — 15 August 2005 276