JN516X Datasheet, PDF (17/94 Pages) NXP Semiconductors – IEEE802.15.4 Wireless Microcontroller

OTP memory using the Flash programmer. [9]. Details on how to obtain and install MAC addresses can be found in
the application note JN-AN-1066 [10]
For further information on how to program and use this facility, please contact technical support.
4.4 EEPROM
The JN516x devices contain 4Kbytes of EEPROM. The maximum number of write cycles or endurance is, 100k
guaranteed and 1M typically while the data retention is guaranteed for at least 20 years. This non-volatile memory is
primarily used to hold persistent data generated from such things as the Network Stack software component (eg
network topology, routing tables). As the EEPROM holds its contents through sleep and reset events, this means
more stable operation and faster recovery is possible after outages. Access to the EEPROM is via registers mapped
into the Flash and EEPROM Registers region of the address map.
The customer may use part of the EEPROM to store its own data if desired by interfacing with the Persistent Data
Manager. Optionally the PDM can also store data in an external memory. For further information, please contact
technical support.
4.5 External Memory
An optional external serial non-volatile memory (eg Flash or EEPROM) with a SPI interface may be used to provide
additional storage for program code, such as a new code image or further data for the device when external power is
removed. The memory can be connected to the SPI Master interface using select line SPISEL0 (see figure 6 for
details)
JN516x
Serial
Memory
SPISEL0
SPIMISO
SPIMOSI
SPICLK
SS
SDO
SDI
CLK
Figure 6: Connecting External Serial Memory
The contents of the external serial memory may be encrypted. The AES security processor combined with a user
programmable 128-bit encryption key is used to encrypt the contents of the external memory. The encryption key is
stored in the flash memory index section. When bootloading program code from external serial memory, the JN516x
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 transparent. For more details, including the how the program code encrypts
data for the external memory, see the application note Boot Loader Operation. [8]
4.6 Peripherals
All peripherals have their registers mapped into the memory space. Access to these registers requires 3 peripheral
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
Peripherals API User Guide [4].
4.7 Unused Memory Addresses
Any attempt to access an unpopulated memory area will result in a bus error exception (interrupt) being generated.
© NXP Laboratories UK 2013
JN-DS-JN516x v1.1 Production
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