Peek Mode

When MODE = 10, the scanner is in Peek mode. Peek mode waits for an instruction cycle in which the CPU does not need to access the NVM (such as a branch instruction) and uses that cycle to do its own NVM access. This results in the lowest throughput for the NVM access (and can take a much longer time to complete a scan than the other modes), but does so without any impact on execution times, unlike the other modes.

Table 1. Summary of Scanner Modes
MODE<1:0> Description
First Scan Access CPU Operation
11 Triggered As soon as possible following a trigger Stalled during NVM access CPU resumes execution following each access
10 Peek At the first dead cycle Timing is unaffected CPU continues execution following each access
01 Burst As soon as possible Stalled during NVM access CPU suspended until scan completes
00 Concurrent CPU resumes execution following each access