SH7710 Datasheet, PDF (565/996 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 15 Realtime Clock (RTC)
Bit
Bit Name Initial Value R/W Description
3
RTCEN
1
R/W Controls the operation of the crystal oscillator for
the RTC.
0: Halts the crystal oscillator for the RTC.
1: Runs the crystal oscillator for the RTC.
2
ADJ
0
R/W 30-Second Adjustment
When 1 is written to the ADJ bit, times of 29
seconds or less will be rounded to 00 seconds
and 30 seconds or more to 1 minute. The divider
circuit (RTC prescaler and R64CNT) will be
simultaneously reset. This bit always reads 0.
0: Runs normally.
1: 30-second adjustment.
1
RESET
0
R/W Reset
When 1 is written, initializes the divider circuit
(RTC prescaler and R64CNT). This bit always
reads 0.
0: Runs normally.
1: Divider circuit is reset.
0
START
1
R/W Start Bit
Halts and restarts the counter (clock).
0: Second/minute/hour/day/week/month/year
counter halts.
1: Second/minute/hour/day/week/month/year
counter runs normally.
Note: The 64-Hz counter always runs unless
stopped with the RTCEN bit.
Rev. 2.00 Dec. 07, 2005 Page 523 of 950
REJ09B0079-0200