NXP Semiconductors KL25 Series - 2.4.3 Memories and Memory Interfaces; 2.4.4 Clocks

Table 2-3. System modules (continued)
Module Description
Crossbar switch (XBS) The XBS connects bus masters and bus slaves, allowing all bus masters to access
different bus slaves simultaneously and providing arbitration among the bus
masters when they access the same slave.
Low-leakage wakeup unit (LLWU) The LLWU module allows the device to wake from low leakage power modes (LLS
and VLLS) through various internal peripheral and external pin sources.
Peripheral bridge The peripheral bridge converts the crossbar switch interface to an interface to
access a majority of peripherals on the device.
DMA multiplexer (DMAMUX) The DMA multiplexer selects from many DMA requests down to 4 for the DMA
controller.
Direct memory access (DMA) controller The DMA controller provides programmable channels with transfer control
descriptors for data movement via dual-address transfers for 8-, 16- and 32-bit
data values.
Computer operating properly watchdog
(WDOG)
The WDOG monitors internal system operation and forces a reset in case of
failure. It can run from an independent 1 kHz low power oscillator with a
programmable refresh window to detect deviations in program flow or system
frequency.
2.4.3 Memories and Memory Interfaces
The following memories and memory interfaces are available on this device.
Table 2-4. Memories and memory interfaces
Module Description
Flash memory Program flash memory — up to 128 KB of the non-volatile flash memory that can
execute program code
Flash memory controller Manages the interface between the device and the on-chip flash memory.
SRAM Up to 16 KB internal system RAM.
2.4.4 Clocks
The following clock modules are available on this device.
Table 2-5. Clock modules
Module Description
Multipurpose Clock Generator (MCG) MCG module containing a frequency-locked-loop (FLL) and phase-locked-loop
(PLL) controlled by internal or external reference oscillator.
System oscillator The system oscillator, in conjunction with an external crystal or resonator,
generates a reference clock for the MCU.
Chapter 2 Introduction
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 41