Interrupt Interaction

The INTM bit controls the scanner’s response to interrupts depending on which mode the NVM scanner is in, as described in the following table.

Table 1. Scan Interrupt Modes
INTM MODE<1:0>
MODE == Burst MODE == CONCURENT or TRIGGERED MODE ==PEEK
1 Interrupt overrides SCANGO (to zero) to pause the burst and the interrupt handler executes at full speed; Scanner Burst resumes when interrupt completes. Scanner suspended during interrupt response (SCANGO = 0); interrupt executes at full speed and scan resumes when the interrupt is complete. This bit is ignored
0 Interrupts do not override SCANGO, and the scan (burst) operation will continue; interrupt response will be delayed until scan completes (latency will be increased). Scanner accesses NVM during interrupt response. This bit is ignored

In general, if INTM = 0, the scanner will take precedence over the interrupt, resulting in decreased interrupt processing speed and/or increased interrupt response latency. If INTM = 1, the interrupt will take precedence and have a better speed, delaying the memory scan.