SH7706 Datasheet, PDF (392/749 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7700 Series

Section 13 Realtime Clock (RTC)
13.3.4 Hour Counter (RHRCNT)
The hour counter (RHRCNT) is an 8-bit read/write register used for setting/counting in the BCD-
coded hour section of the RTC. The count operation is performed by a carry for each 1 hour of the
minute counter.
The range of hour can be set is 00 to 23 (decimal). Errant operation will result if any other value is
set. Carry out write processing after halting the count operation with the START bit in RCR2.
RHRCNT is not initialized by a power-on reset or manual reset, or in standby mode.
Bit
7, 6
5, 4
3 to 0
Bit Name Initial Value R/W

All 0
R


R/W


R/W
Description
Always read as 0.
Counter for 10-unit of hour in the BCD-code.
The range can be set from 0 to 2 (decimal).
Counter for 1-unit of hour in the BCD-code.
The range can be set from 0 to 9 (decimal).
13.3.5 Day of the Week Counter (RWKCNT)
The day of the week counter (RWKCNT) is an 8-bit read/write register used for setting/counting
in the BCD-coded day of week section of the RTC. The count operation is performed by a carry
for each day of the date counter.
The range for day of the week can be set is 0 to 6 (decimal). Errant operation will result if any
other value is set. Carry out write processing after halting the count operation with the START bit
in RCR2.
RWKCNT is not initialized by a power-on reset or manual reset, or in standby mode.
Rev. 5.00 May 29, 2006 page 344 of 698
REJ09B0146-0500