SM8578 Nippon_Precision_Circuits America, SM8578 Datasheet - Page 6

• Manufacturer Part Number: SM8578
• Description: Real-time Clock IC
• Manufacturer: Nippon_Precision_Circuits America

FUNCTIONAL DESCRIPTION
Register Table
*1. The AF and TF bits have “0” only valid write data values.
Note 1. When power is applied, all register values are undefined, hence they must be initialized.
Note 2. When Register D is read, the previously preset data value written to the register is read.
Address
C
D
6
7
8
9
A
B
E
F
0
1
2
3
4
5
Fixed-cycle counter
Day-of-week alarm
Minute alarm
Day-of-week
Hour alarm
Fixed cycle
Day alarm
Frequency
Function
Control 1
Control 2
Second
Minute
Month
Hour
Year
Day
FOS
Bit7
128
AE
AE
AE
AE
FE
TE
80
fr
fr
fr
fr
fr
*
*
TEST
Bit6
40
40
40
40
64
6
6
*
*
*
*
*
*
*
*
Bit5
FD4
TD1
20
20
20
20
20
20
20
20
32
5
5
*
*
*
SM8578BV
RESET
TI/TP
Bit4
FD3
TD0
10
10
10
10
10
10
10
10
10
16
4
4
HOLD
Bit3
AF
8
8
8
3
8
8
8
8
8
3
8
8
*
*
Bit2
FD2
TF
4
4
4
2
4
4
4
4
4
2
4
4
*
*
NIPPON PRECISION CIRCUITS INC.—6
Bit1
FD1
AIE
2
2
2
1
2
2
2
2
2
1
2
2
*
*
Bit0
FD0
TIE
1
1
1
0
1
1
1
1
1
0
1
1
*
*
Read
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Excl. bit 7
Excl. bit 7
Excl. bit 7
Excl. bit 7
Excl. bit 7
Write
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
*1