SH7721 datasheet(631/1524 Pages) RENESAS

631 / 1524 page

Section 17 Realtime Clock (RTC)

Rev. 3.00 Jan. 18, 2008 Page 569 of 1458

REJ09B0033-0300

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

Bit Name

Initial Value

R/W

Description

7 to 5



All 0

Reserved

These bits are always read as 0. Though writing

has no effect, the write value should always be 0.



Undefined

R/W

Counting Ten’s Position of Months

3 to 0



Undefined

R/W

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

Initial Value

R/W

Description

15 to 12



Undefined

R/W

Counting Thousand’s Position of Years

11 to 8



Undefined

R/W

Counting Hundred’s Position of Years

7 to 4



Undefined

R/W

Counting Ten’s Position of Years

3 to 0



Undefined

R/W

Counting One’s Position of Years

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