HD64F38602R Datasheet, PDF (231/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 11 Realtime Clock (RTC)
11.6 Usage Notes
11.6.1 Note on Clock Count
The subclock must be connected to the 32.768-kHz resonator. When the 38.4-kHz resonator etc. is
connected, the correct time count is not possible.
11.6.2 Note when Using RTC Interrupts
The RTC registers are not reset by a RES input, power-on, or overflow of the watchdog timer, and
their values are undefined after power-on.
When using RTC interrupts, make sure to initialize the values before setting the IENRTC bit in
IENR1 to 1.
Rev. 3.00 May 15, 2007 Page 199 of 518
REJ09B0152-0300