RTC4573 Epson Company, RTC4573 Datasheet - Page 5

• Manufacturer Part Number: RTC4573
• Description: Serial RTC with Alarm and Timer
• Manufacturer: Epson Company

1.1 Timekeeping/calendar registers (register 0 to register 6)
n
Address
· The data in these registers is BCD format. For example, "0101 1001" represents 59 seconds. In addition, the
· Writing to a bit marked with an asterisk ("*") is permitted; such bits can be used as RAM. When the alarm and
· Year register and leap years
· Day of the week
· fr ( READ Flag )
· fos ( OSC Flag )
Register Table
"*" mark in the register table means that the register is readable and writable, and can be used as RAM. Time is
kept in the 24-hour format.
timer functions are not used, registers 7 to A can be used as 8-bit memory registers, and registers C and D can
be used as 7-bit memory registers.
year is a leap year. Therefore, leap years can be automatically determined whether the year is numbered
according to the western calendar or the Japanese calendar (year of Heisei).
not set more than one bit to "1" at any one time.
that carry to a figure rose during (CE input ="H" during readout of register in an indicator by this for 1 second is
possible. When fr was "1", I need to read register in all indicators once again.
A leap year is detected by dividing the two BCD digits of the year register by four; if the remainder is zero, the
The day of the week register uses 7 bits, from 0 to 6; the meanings of the bits are shown in the table below. Do
It is the binary digit that turn into "1" when CE was input, and carry occurred during "H" for 1 second. The distinction
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
This flag uses it for a monitor of battery listing degradation with the binary digit which that oscillation stopped is
set at. Oscillation stopping shows "1", and it is cleared by writing in "0". But fo flag can't write in "0" when
oscillation stopped. And fo can write in "1", but don't write in it. Other binary digit (HOLD,STOP,RESET) doesn't
receive affect even in case of "1".
bit 6
0
0
0
0
0
0
1
Timer interrupt control
Count Down Timer
Minutes Alarm
FOUT control
Hours Alarm
Week Alarm
Day Alarm
Control 1
Control 2
Function
Month
bit 5
Week
Hour
Year
Day
Sec
Min
0
0
0
0
0
1
0
bit 4
0
0
0
0
1
0
0
bit7
128
bit 3
fos
AE
AE
AE
AE
FE
TE
80
fr
fr
fr
fr
fr
*
*
0
0
0
1
0
0
0
TEST
bit6
40
40
40
40
64
6
6
*
*
*
*
*
*
*
*
bit 2
Page-5
0
0
1
0
0
0
0
STOP RESET HOLD
FD4
TD1
bit5
20
20
20
20
20
20
20
20
32
5
5
*
*
bit 1
0
1
0
0
0
0
0
TI/TP
FD3
TD0
bit4
10
10
10
10
10
10
10
10
10
16
4
4
bit 0
1
0
0
0
0
0
0
bit3
AF
8
8
8
3
8
8
8
8
8
3
8
8
*
*
day of week
Wednesday
Thursday
Saturday
Tuesday
FD2
Monday
bit2
Sunday
TF
Friday
4
4
4
2
4
4
4
4
4
2
4
4
*
*
FD1
bit1
AIE
2
2
2
1
2
2
2
2
2
1
2
2
*
*
FD0
bit0
TIE
1
1
1
0
1
1
1
1
1
0
1
1
*
*
Aug.1998