Hi Karen
You are right here! Thanks for pointing it out! The description in Table 54 is the correct one for HRCFG description.
When bit is 0, the first HREADY signal (high-to-low transition) is obtained after HSTIME (750ms). After that, HREADY signal is available every HRATE period (128ms).
When bit is 1, the first HREADY signal is obtained immediately, followed by repeated indications every HRATE period.
Answering to your questions:
1. The HREADY pin stays low for a while (10us) and then rises back up just for convenience purpose. The low-to-high transition does not indicate the start of the harmonic computations. So, you need to monitor just the high-to-low transition every time.
2. After any configuration change, it takes 750ms for the readings to settle down completely. So, if you select a HRATE lower than that, you will get less accurate results for the first 750ms. After that, the results will be good even at a faster update rate.
Regards
hmani