Timer Data Organization - Epson Q41454351000200 Applications Manual

RTC - 4543 SA/SB

6. Timer Data Organization

• The counter data is BCD code.
• The timer automatically adjusts for different month lengths and for leap year.
• The time is indicated in 24-hour format.
• Writes and reads are both performed on an LSB-first basis.
Second
( 0 to 59 )
Minutes
( 0 to 59 )
Hour ( 0 to 23 )
Day of the week
( 1 to 7 )
Day ( 1 to 31 )
Month ( 1 to 12 )
Year ( 0 to 99 )
* bits: Any data may be written to these bits.
• FDT bit: Supply voltage detection bit
• This bit is set to "1" when voltage of 1.7 ± 0.3 V or less is detected between V
• The FDT bit is cleared if all of the digits up to the year digits are read.
• Although this bit can be both read and written, normally set this bit to "0".
V
DD
Detection
pulse
Mode
FDT bit
The supply voltage detection circuit monitors the supply voltage once every 0.5 seconds;
if the supply voltage is lower than the detection voltage value, the FDT bit is set to "1".
• TM bit: This is a test bit for SEIKO-EPSON's use. Always set this bit to "0".
MSB
FDT s40
* mi40 mi20
* *
* *
TM *
y80 y40
V
DET
0.5 s
s20 s10 s8
mi10 mi8
h20 h10 h8
*
d20 d10 d8
* mo10 mo8
y20 y10 y8
0.5 s
Read
Page - 6
LSB
s4 s2 s1
mi4 mi2 mi1
h4 h2 h1
w4 w2 w1
d4 d2 d1
mo4 mo2 mo1
y4 y2 y1
and GND.
DD
MQ252-04