NXP Semiconductors K32 L2A Series, Reference Manual, Page: 1042 / 1379

41.1.3 RTC signal descriptions
Table 41-1. RTC signal descriptions
Signal Description I/O
RTC_CLKOUT Prescaler square-wave output or 32kHz
crystal clock O
41.1.3.1 RTC clock output
The RTC_CLKOUT signal can output either a square wave prescaler output
(configurable to 1, 2, 4, 8, 16, 32, 64 or 128 Hz) or the 32 kHz crystal clock.
41.2 Register definition
All registers must be accessed using 32-bit writes and all register accesses incur three
wait states.
Write accesses to any register by non-supervisor mode software, when the supervisor
access bit in the control register is clear, will terminate with a bus error.
Read accesses by non-supervisor mode software complete as normal.
Writing to a register protected by the lock register does not generate a bus error, but the
write will not complete.
RTC memory map
Absolute
address
(hex)
Register name
Width
(in bits)
Access Reset value
Section/
page
4003_8000 RTC Time Seconds Register (RTC_TSR) 32 R/W 0000_0000h 41.2.1/1043
4003_8004 RTC Time Prescaler Register (RTC_TPR) 32 R/W 0000_0000h 41.2.2/1043
4003_8008 RTC Time Alarm Register (RTC_TAR) 32 R/W 0000_0000h 41.2.3/1044
4003_800C RTC Time Compensation Register (RTC_TCR) 32 R/W 0000_0000h 41.2.4/1044
4003_8010 RTC Control Register (RTC_CR) 32 R/W 0000_0000h 41.2.5/1045
4003_8014 RTC Status Register (RTC_SR) 32 R/W 0000_0001h 41.2.6/1047
4003_8018 RTC Lock Register (RTC_LR) 32 R/W 0000_00FFh 41.2.7/1048
4003_801C RTC Interrupt Enable Register (RTC_IER) 32 R/W 0000_0007h 41.2.8/1049
Register definition
K32 L2A Reference Manual, Rev. 2, 01/2020
1042 NXP Semiconductors