ATmega328PB

31.4.2 NRWW – No Read-While-Write Section

The code located in the NRWW section can be read when the boot loader software is updating a page in the RWW section. When the boot loader code updates the NRWW section, the CPU is halted during the entire page erase or page write operation.

Table 31-1. Read-While-Write Features
Which Section does the Z-pointer Address During the Programming?	Which Section can be Read During Programming?	CPU Halted?	Read-While-Write Supported?
RWW Section	NRWW Section	No	Yes
NRWW Section	None	Yes	No

Figure 31-1. Read-While-Write vs. No Read-While-Write

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