14.10.4 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 14-1. Summary of Scanner Modes
MODE[1:0]Description
First Scan AccessCPU Operation
11TriggeredAs soon as possible following a triggerStalled during NVM accessCPU resumes execution following each access
10PeekAt the first dead cycleTiming is unaffectedCPU continues execution following each access
01BurstAs soon as possibleStalled during NVM accessCPU suspended until scan completes
00ConcurrentCPU resumes execution following each access