Maximum tUSER for SPI Active and Passive Modes

The following waveform illustrates the minimum and maximum values for tUSER.

  • Point A—User-defined trigger point to start counter on tUSER
  • Point B—VIH (with Schmitt Trigger) of I/Os

The maximum tUSER value can be derived based on the following formula:

Table 1. tUSER Maximum
Configuration Setup tUSER Maximum
Single tUSER = t(from A to B) + tUSER_MIN
Slave in a dual- SPI chain
Master in a dual- SPI chain tUSER = (1344 / SPI_WIDTH) * CCK period + tUSER_MIN + t(from A to B)