SH7261 datasheet(679/1348 Pages) RENESAS

679 / 1348 page

Section 15 Realtime Clock (RTC)

Rev. 2.00 Sep. 07, 2007 Page 647 of 1312

REJ09B0320-0200

15.3.6

Date Counter (RDAYCNT)

RDAYCNT is used for setting/counting in the BCD-coded date section. The count operation is

performed by a carry for each day of the hour counter.

The assignable range is from 01 through 31 (practically in BCD), otherwise operation errors occur.

Carry out write processing after stopping the count operation through the setting of the START bit

in RCR2.

RDAYCNT is not initialized by a power-on reset or manual reset, or in deep standby and software

standby modes.

The range of date changes with each month and in leap years. Please confirm the correct setting.

Leap years are recognized by dividing the year counter values by 400, 100, and 4 and obtaining a

fractional result of 0. The year counter value of 0000 is included in the leap year.

R/W

Bit:

Initial value:

R/W:

——

10 days

——

R/W

—

R/W

——

—

1 day

Bit

Bit Name

Initial

Value

R/W

Description

7, 6



All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

5, 4

10 days

Undefined

R/W

Counting Ten's Position of Dates

3 to 0

1 day

Undefined

R/W

Counting One's Position of Dates

Counts on 0 to 9 once per date. When a carry is

generated, 1 is added to the ten's position.

SH7261 Datasheet(PDF) 679 Page - Renesas Technology Corp

SH7261 Datasheet(HTML) 679 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL