SH7720 Datasheet, PDF (631/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 17 Realtime Clock (RTC)
17.3.7 Month Counter (RMONCNT)
RMONCNT is used for setting/counting in the BCD-coded month section. The count operation is
performed by a carry for each month of the date counter.
The range of month can be set is 01 to 12 (decimal). Errant operation will result if any other value
is set. Carry out write processing after stopping the count operation with the START bit in RCR2.
RMONCNT is not initialized by a power-on reset or manual reset, or in standby mode.
Bit
7 to 5
4
3 to 0
Bit Name

Initial Value R/W
All 0
R

Undefined R/W

Undefined R/W
Description
Reserved
These bits are always read as 0. Though writing
has no effect, the write value should always be 0.
Counting Ten’s Position of Months
Counting One’s Position of Months
Counts on 0 to 9 once per month. When a carry
is generated, 1 is added to the ten’s position.
17.3.8 Year Counter (RYRCNT)
RYRCNT is used for setting/counting in the BCD-coded year section. The count operation is
performed by a carry for each year of the month counter.
The range for year which can be set is 0000 to 9999 (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 or using a carry flag.
RYRCNT is not initialized by a power-on reset or manual reset, or in standby mode.
Bit
Bit Name
15 to 12 
11 to 8 
7 to 4 
3 to 0 
Initial Value R/W
Undefined R/W
Undefined R/W
Undefined R/W
Undefined R/W
Description
Counting Thousand’s Position of Years
Counting Hundred’s Position of Years
Counting Ten’s Position of Years
Counting One’s Position of Years
Rev. 3.00 Jan. 18, 2008 Page 569 of 1458
REJ09B0033-0300