s-35399a02 Seiko Instruments Inc., s-35399a02 Datasheet - Page 40

• Manufacturer Part Number: s-35399a02
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

40
2-WIRE REAL-TIME CLOCK
S-35399A02
(5) Clock-correction register access
(6) Free register access
(7) Up counter access
Access to the up counter is Read-only. Users cannot Write in this counter with Write operation.
*1. Set NO_ACK = 1
*1. Set NO_ACK = 1
SDA
SCL
I/O mode switching
0
Code + command
1
1
1
SDA
SCL
SCL
SDA
1
in Read
in Read
I/O mode switching
I/O mode switching
0
Figure 51 Clock-Correction Register Access
0
0
.
.
1
0
0
Figure 52 Free Register Access
Figure 53 Up Counter Access
1
1
command
command
1
1
Read only
9
Code +
Code +
1
1
B7
0
Seiko Instruments Inc.
0
Count data
1
1
1
1
0
1
R/W
R/W
I/O mode switching
9
Clock
correction data
9
B7
B7
Free register
data
B0
18
I/O mode switching
B0
B0
I/O mode switching
18
18
27
B7
Count data
B0
36
Rev.1.0
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