Clocks, Reset, and Power (CRP)
PXN20 Microcontroller Reference Manual, Rev. 1
6-4 Freescale Semiconductor
6.1.3 Modes of Operation
There are two functional modes of operation for the CRP: normal operation and sleep mode.
In normal operation, all CRP registers can be read or written. The input isolation, low-power FSM, and
wake-up logic are disabled. The voltage regulator, LVI, and power switch outputs are in the enabled state.
The RTC/API and associated interrupts are optionally enabled.
In sleep mode, the bus interface is disabled and the input isolation is enabled. The RTC/API is enabled if
enabled prior to entry into sleep. See Section 6.4.2, RTC Functional Description, for further details.
6.2 Memory Map and Registers
This section provides a detailed description of all CRP registers.
6.2.1 Module Memory Map
The CRP memory map is shown in Table 6-1. The address of each register is given as an offset to the CRP
base address. Registers are listed in address order, identified by complete name and mnemonic, and lists
the type of accesses allowed.
Table 6-1. CRP Memory Map
Offset from
CRP_BASE
(0xFFFE_C000)
Register Access Reset Value Section/Page
0x0000 CRP_CLKSRC—Clock source register R/W 0x0001_1F3F 6.2.2.1/6-5
0x0004–0x000F Reserved
0x0010 CRP_RTCC—RTC control register R/W 0x0000_0000 6.2.2.2/6-6
0x0014 CRP_RTSC—RTC status register R 0x0000_0000 6.2.2.3/6-8
0x0018 CRP_RTCCNT—RTC counter register R 0x0000_0000 6.2.2.4/6-9
0x001C–0x003F Reserved
0x0040 CRP_PWKENH—Pin wakeup enable high register R/W 0x0000_0000 6.2.2.5/6-9
0x0044 CRP_PWKENL—Pin wakeup enable low register R/W 0x0000_0000 6.2.2.5/6-9
0x0048 CRP_PWKSRCIE—Pin wakeup source interrupt enable
register
R/W 0x0000_0000 6.2.2.6/6-11
0x004C CRP_PWKSRCF—Pin wakeup source flag register R 0x0000_0000 6.2.2.7/6-11
0x0050 CRP_Z6VEC—Z6 reset vector register R/W 0xFFFF_0001 6.2.2.8/6-12
0x0054 CRP_Z0VEC—Z0 reset vector register R/W 0xFFFF_FFFE 6.2.2.9/6-12
0x0058 CRP_RECPTR—Recovery pointer register R/W 0xFFFF_FFFC 6.2.2.10/6-13
0x005C–0x005F Reserved
0x0060 CRP_PSCR—Power status and control register R/W 0x0000_0000 6.2.2.11/6-14
0x0064–0x006F Reserved
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