Calendar Counter ( Week - Year ); Week; Day; Month - Epson RA8900SA/CE Applications Manual

RA8900 SA / CE

8.2.2. Calendar counter ( WEEK - YEAR )

Address Function
03, 13
)
"o" indicates write-protected bits. A zero is always read from these bits.
1) Day of the 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 01hDay 02hDay 04hDay 08hDay 10hDay
20hDay 40hDay 01hDay 02h, etc.
 The correspondence between days and count values is shown below.

WEEK

Write/Read
Write prohibit
Address
04, 14
05, 15
06, 16
)
"o" indicates write-protected bits. A zero is always read from these bits.
 The auto calendar function updates all dates, months, and years from January 1, 2001 to December 31, 2099.
 The data format is BCD format. For example, a date register value of "0011 0001" indicates the 31st.
Note with caution that writing non-existent date data may interfere with normal operation of the calendar counter.
2) Date counter
Address
04, 14
 The updating of dates by the date counter varies according to the month setting.
 A leap year is set whenever the year value is a multiple of four (such as 04, 08, 12, 88, 92, or 96). In
February of a leap year, the counter counts dates from "01," "02," "03," to "28," "29," "01," etc.
3) Month counter
Address
05, 15
 The month counter counts from 01 (January), 02 (February), and up to 12 (December), then starts again at
01 (January).
4) Year counter
Address
06, 16
 The year counter counts from 00, 01, 02 and up to 99, then starts again at 00.
Any year that is a multiple of four (04, 08, 12, 88, 92, 96, etc.) is handled as a leap year.
bit 7
WEEK

bit 7 bit 6 bit 5
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0
1
0 1 0
 Do not set "1" to more than one day at the same time.
Also, note with caution that any setting other than the
seven shown above should not be made as it may
interfere with normal operation.
Function bit 7

DAY



MONTH



YEAR

80
Function bit 7
DAY

DAY
1, 3, 5, 7, 8, 10, or 12
4, 6, 9, or 11
Write/Read
February in normal year
February in leap year
Function bit 7
MONTH

Function bit 7
YEAR Y80
bit 6 bit 5 bit 4
6 5 4
bit 4 bit 3 bit 2 bit 1
0 0 0
0 0 0
0 0 1
0 1 0
1 0 0
0 0 0
0 0 0
bit 6 bit 5 bit 4
20 10

10
 
40 20 10
bit 6 bit 5 bit 4
20 10

Month
bit 6 bit 5 bit 4
10
 
bit 6 bit 5 bit 4
Y40 Y20 Y10
Page - 9
bit 3 bit 2 bit 1
3 2 1
bit 0 Day
0 1 Sunday
1 0 Monday
0 0 Tuesday
0 0 Wednesday
0 0 Thursday
0 0 Friday
0 0 Saturday

bit 3 bit 2 bit 1
8 4 2
8 4 2
8 4 2
bit 3 bit 2 bit 1
8 4 2
Date update pattern
01, 02, 03  30, 31, 01 
01, 02, 03  30, 01, 02 
01, 02, 03  28, 01, 02 
01, 02, 03  28, 29, 01 
bit 3 bit 2 bit 1
8 4 2
bit 3 bit 2 bit 1
Y8 Y4 Y2
ETM44E-01
bit 0
0
Data [h]
01 h
02 h
04 h
08 h
10 h
20 h
40 h

bit 0
1
1
1
bit 0
1
bit 0
1
bit 0
Y1