nRF24LE1 Nordic VLSI, nRF24LE1 Datasheet - Page 80

• Manufacturer Part Number: nRF24LE1
• Manufacturer: Nordic VLSI

nRF24LE1 Preliminary Product Specification
RDISMB - Enable Read DISable of MainBlock)
SPI command RDISMB enables the readback protection of the flash. The command disables all read/
erase and write access to the flash main block from any external interface (SPI or HW debug JTAG). It also
disabled erase and write operations in the InfoPage, but read InfoPage read operations are still possible.
This will protect code and data in the device from being retrieved through the external flash interfaces.
Before the RDISMB command the write enable latch WEN must be enabled through the WREN SPI com-
mand. Once the RDISMB command is sent all SPI connection/control of the flash from the SPI interface is
lost. It is important that this command is the last one to be sent in a flash programming sequence.
The command is a 1 byte command with no data.
ENDEBUG - Enable DEBUG
SPI command ENDEBUG enables the on chip support for HW debug. It will also enable the HW debug
JTAG interface.
Before the operation the write enable latch WEN must be enabled by SPI command WREN. After the HW
debug features are enabled, only an ERASE ALL operation on the flash can reset it.
The command is a 1 byte command with no data.
6.3.5
Hardware support for firmware upgrade
When some of the flash memory is configured as MCU write protected (FPCR.NUPP) and nRF24LE1 is
restarted from the protected area, the memory mapping actually changes to make FW upgrades safer.
Fig-
ure 35.
shows an example with unprotected and protected area of the flash code space as it will be after
programming the flash.
Revision 1.1
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