JN5139/001,515 NXP Semiconductors, JN5139/001,515 Datasheet - Page 16

• Manufacturer Part Number: JN5139/001,515
• Description: IC MCU 32BIT 56QFN
• Manufacturer: NXP Semiconductors

Specifications of JN5139/001,515

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

When bootloading program code from external serial memory, the JN5139 automatically accesses the encryption key
to execute the decryption process. User program code does not need to handle any of the decryption process; it is a
transparent process.
With encryption enabled, the time taken to boot code from external Flash memory is increased.
4.5 Peripherals
All peripherals have their registers mapped into the memory space. Access to these registers requires 3 clock
cycles. Applications have access to the peripherals through the software libraries that present a high-level view of
the peripheral’s functions through a series of dedicated software routines. These routines provide both a tested
method for using the peripherals and allow bug-free application code to be developed more rapidly. For details, see
the Integrated Peripherals API Reference Manual (JN-RM-2001).
4.6 Unused Memory Addresses
Any attempt to access an unpopulated memory area will result in a bus error exception (interrupt) being generated.
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JN-DS-JN5139 1v9
© NXP Laboratories UK 2010