Skip to main content
Knowledgebase
Home
Renesas Electronics Europe - Knowledgebase

Is O can only be read from register when reading RTC time after reset?

Latest Updated:05/28/2013

Question:

After returning from reset, software standby mode, or deep software standby mode, only 0 can be read from the counter register when reading the RTC time.

Answer:

If the clock is operating (RCR2.START bit = 1), wait 1/128 of a second after returning before reading the counter register.
The counter register can be read correctly.

Please see Points for Caution When Writing to and Reading from Registers in the Realtime Clock chapter of the user's manual: hardware.

Suitable Products
RX62N, RX621
RX630
RX63N, RX631
RX210
RX220
RX110
RX111