s-35399a03 Seiko Instruments Inc., s-35399a03 Datasheet - Page 38

• Manufacturer Part Number: s-35399a03
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

38
2-WIRE REAL-TIME CLOCK
S-35399A03
(8) Free register 2 access and free register 3 access
(9) Alarm expansion register 1 access and alarm expansion register 2 access
*1. 0 : Alarm expansion register 1 access, 1 : Alarm expansion register 2 access
*2. Transmit ACK = 0 from the master device to the S-35399A03 in Read.
*3. Set NO_ACK = 1 in Read.
Write in the alarm expansion register 1 (alarm expansion register 2) after setting the status register 2.
Figure 48 Alarm Expansion Register 1 Access and Alarm Expansion Register 2 Access
SDA
SCL
I/O mode switching
SDA
SCL
Figure 47 Free Register 2 Access and Free Register 3 Access
0
I/O mode switching
1
1
command
Code +
1
1
*1
1
*1. To select register, use the following settings.
*2. Set NO_ACK = 1 in Read.
0
0
a
0
1
1
1
command
Code +
1
*1
R/W
1
9
b
1
0
B7
0
Seiko Instruments Inc.
a b
Year data
R/W
9
Free register
data
B7
B0
I/O mode switching
Register to select
Free register 2
Free register 3
18
B7
Month data
B0
I/O mode switching
18
B0
27
B7
Second data
B0
36
Rev.1.0
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