r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 842

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

Section 22 Realtime Clock (RTC)
Rev. 1.00 Oct. 01, 2007 Page 776 of 1956
REJ09B0256-0100
Bit
2
1
0
Bit Name
ADJ
RESET
START
Initial
Value
0
0
1
R/W
R/W
R/W
R/W
Description
30-Second Adjustment
Used for 30-second adjustment. When 1 is written to
this bit, a value up to 29 seconds is rounded down to 00
seconds, and a value of 30 seconds or more is rounded
up to 1 minute. The frequency divider circuits (RTC
prescaler and R64CNT) are also reset at this time. This
bit always returns 0 if read.
0: Normal clock operation
1: 30-second adjustment performed
Reset
The frequency divider circuits are initialized by writing 1
to this bit. When 1 is written to the RESET bit, the
frequency divider circuits (RTC prescaler and R64CNT)
are reset and the RESET bit is automatically cleared to
0 (i.e. does not need to be written with 0).
0: Normal clock operation
1: Frequency divider circuits are reset
Start Bit
Stops and restarts counter (clock) operation.
0: Second, minute, hour, day, day-of-week, month, and
1: Second, minute, hour, day, day-of-week, month, and
Note: * The 64 Hz counter continues to operate unless
year counters are stopped*
year counters operate normally*
stopped by means of the RTCEN bit.