HD64F38602R Datasheet, PDF (219/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 11 Realtime Clock (RTC)
11.3 Register Descriptions
The RTC has the following registers.
• Second data register/free running counter data register (RSECDR)
• Minute data register (RMINDR)
• Hour data register (RHRDR)
• Day-of-week data register (RWKDR)
• RTC control register 1 (RTCCR1)
• RTC control register 2 (RTCCR2)
• Clock source select register (RTCCSR)
• RTC interrupt flag register (RTCFLG)
11.3.1 Second Data Register/Free Running Counter Data Register (RSECDR)
RSECDR counts the BCD-coded second value. The setting range is decimal 00 to 59. It is an 8-bit
read register used as a counter, when it operates as a free running counter. For more information
on reading seconds, minutes, hours, and day-of-week, see section 11.4.3, Data Reading Procedure.
Initial
Bit
Bit Name Value R/W Description
7
BSY
—/(0)* R
RTC Busy
This bit is set to 1 when the RTC is updating (operating)
the values of second, minute, hour, and day-of-week data
registers. When this bit is 0, the values of second, minute,
hour, and day-of-week data registers must be adopted.
6
SC12
—/(0)* R/W Counting Ten's Position of Seconds
5
SC11
—/(0)* R/W Counts on 0 to 5 for 60-second counting.
4
SC10
—/(0)* R/W
3
SC03
—/(0)* R/W Counting One's Position of Seconds
2
SC02
—/(0)* R/W Counts on 0 to 9 once per second. When a carry is
1
SC01
—/(0)* R/W ^{generated, 1 is added to the ten's position.}
0
SC00
—/(0)* R/W
Note: * Initial value after a reset caused by the RST bit in RTCCR1.
Rev. 3.00 May 15, 2007 Page 187 of 518
REJ09B0152-0300