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ETM62E-02 Seiko Epson Corporation 26
14.1.2. Week Counter
The day (of the week) is indicated by 7 bits, bit 0 to bit 6.
The day data values are counted as: Day 01hDay 02hDay 04hDay 08hDay 10hDay 20hDay 40h
Day 01hDay 02h, etc.
It is incremented when carry is generated from the HOUR register. This register does not generate carry to a higher register.
Since this register is not connected with the YEAR, MONTH and DAY registers, it needs to be set again with the matching day of
the week if any of the YEAR, MONTH or DAY registers have been changed.
When not use Week data, It is not necessary for Week register to be initialized.
Do not set 1 to more than one day at the same time.
Table 17 Week Register
.
14.1.3. Calendar Counter
1) [DAY],[MONTH]resister
The DAY register is a variable (between 28-base and 31-base) BCD counter that is influenced by the month and the leap
year. The MONTH register is 12-base BCD counter. when carry is generated from a lower register.
Table 18 DAY, MONTH Register
2) [YEAR]register
This register is a BCD counter for years 00 to 99.
The leap year is automatically determined and influences the DAY register.
This RTC processes following years as leap years: 00,04,08,12, 96.
User software correction is needed in the years 2100, 2200, 2300 as they are common years.
Definition of leap years
Leap year: year divisible by 4, year divisible by 400
Ex. 2000, 2004, 2008, 2012, 2096, 2400, 2800,
Common year: year indivisible by 4, year divisible by 100
Ex. 2001, 2002, 2003, 2005, 2099, 2100, 2200, 2300, 2500,,
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