S-35390A Seiko Instruments, S-35390A Datasheet - Page 9

• Manufacturer Part Number: S-35390A
• Description: 2-Wire Real Time Clock
• Manufacturer: Seiko Instruments

Rev.1.2
C2 C1 C0
2. Command configuration
*1.
*2.
*3.
*4.
*5.
*6.
*7.
0
0
0
0
1
1
1
1
There are eight types of commands that read from and write to various registers. The table below lists
these commands.
0
0
1
1
0
0
1
1
Write-only flag. By writing “1” to this register, the IC is reset.
Scratch bit. R/W-enabled register that can be freely used by users.
Read-only flag. It is cleared when read. It is valid only when the alarm is set.
Read-only flag. “POC” is set to “1” when power is applied. It is cleared when read. For the “BLD”, refer
to “Power Supply Voltage Detector”.
For IC testing. Normally set this register to “0”.
No effect by writing. It is “0” when read.
This is a R/W-enabled register that does not affect interrupts.
_00
0
1
0
1
0
1
0
1
(year data to)
(hour data to)
Status register_1 access
Status register_2 access
Real-time data 1 access
Real-time data 2 access
INT1 register_1 access
(alarm time 1)
(INT1AE = 1, INT1ME = 0, INT1FE = 0) A1mE
INT1 register_1 access
(frequency duty setting)
(INT1ME = 0, INT1FE = 1)
INT1 register_2 access
(alarm time 2)
(INT2AE = 1, INT2ME = 0, INT2FE = 0)
INT1 register_2 access
(frequency duty setting)
(INT2ME = 0, INT2FE = 1)
Clock adjustment register access
Free register access
Command
Description
Table 9 Command List
Seiko Instruments Inc.
TEST
POC
A1WE
A2WE
A2mE
A1HE
A2HE
SC
SC









Y80
B7
V7
F7
*6
*6
*6
*6
*6
*6
*6
*6
*6
*7
*7
*4
*5
INT2AE INT2ME INT2FE 32kE INT1AE INT1ME INT1FE
AM/PM
AM/PM
AM/PM
AM/PM
BLD
SC
SC



m40
m40

m40

m40
Y40
s40
s40
B6
V6
F6
*6
*6
*6
*6
*6
*7
*7
*4
INT2
SC
SC

D20

H20
m20
H20
m20

H20
m20

H20
m20
Y20
s20
s20
B5
V5
F5
*6
*6
*6
*6
*7
*7
*3
INT1
16 Hz
16 Hz
M10
m10
m10
m10
m10
D10

H10
H10

H10

H10
Y10
s10
s10
B4
V4
F4
2-WIRE REAL-TIME CLOCK
*6
*6
*6
*3
Data
SC1
8 Hz
8 Hz



M8
m8
m8
m8
m8
D8
H8
H8
H8
H8
B3
Y8
V3
F3
s8
s8
*6
*6
*6
*2
SC0
4 Hz
4 Hz
W4
W4
W4
M4
m4
m4
m4
m4
D4
H4
H4
H4
H4
B2
Y4
V2
F2
s4
s4
*2
12/24
2 Hz
2 Hz
W2
W2
W2
M2
m2
m2
m2
m2
B1
Y2
D2
H2
H2
H2
H2
V1
F1
S-35390A
s2
s2
RESET
1 Hz
1 Hz
M1
W1
m1
m1
W1
m1
W1
m1
D1
H1
H1
H1
H1
B0
Y1
V0
F0
s1
s1
*1
9