Datasheet

Table 4. Module clocks (continued)

Module Bus interface clock Internal clocks I/O interface clocks

TPM Bus clock TPM clock TPM_CLKIN0, TPM_CLKIN1

PDB Bus clock — —

PIT Bus clock — —

LPTMR Bus clock LPO, OSCERCLK,

MCGIRCLK, ERCLK32K

—

RTC Bus clock EXTAL32 —

Communication interfaces

USB FS OTG System clock USB FS clock —

USB DCD Bus clock — —

SPI System clock — DSPI_SCK

I2C Bus clock — I2C_SCL

LPUART Bus clock LPUART clock —

EMVSIM Bus clock EMVSIM clock —

FlexIO Bus clock FlexIO clock —

Human-machine interfaces

GPIO Platform clock — —

TSI Bus clock LPO, ERCLK32K,

MCGIRCLK

—

2.1.7 Security

Security state can be enabled via programming flash configuration field (0x40e). After

enabling device security, the SWD port cannot access the memory resources of the

MCU, and ROM boot loader is also limited to access flash and not allowed to read out

flash information via ROM boot loader commands.

Access interface Secure state Unsecure operation

SWD port Cannot access memory source by SWD

interface

The debugger can write to the Flash

Mass Erase in Progress field of the

MDM-AP Control register to trigger a

mass erase (Erase All Blocks)

command

ROM boot loader Interface

(UART/I2C/SPI/USB)

Limit access to the flash, cannot read

out flash content

Send “FlashEraseAllUnsecureh"

command or attempt to unlock flash

security using the backdoor key

This device features 128-bit unique identification number, which is programmed in

factory and loaded to SIM register after power-on reset.

Overview

Kinetis KL82 Microcontroller, Rev. 3, 08/2016

NXP Semiconductors