s-35392a Seiko Instruments Inc., s-35392a Datasheet - Page 31

• Manufacturer Part Number: s-35392a
• Description: 2-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

Rev.1.3
4. Data access
(1) Real-time data 1 access
(2) Real-time data 2 access
(3) Status register 1 access and status register 2 access
*1. Set NO_ACK = 1 in Read.
*2. Transmit ACK = 0 from the master device to the S-35392A
*1. Set NO_ACK = 1 in Read.
*2. Transmit ACK = 0 from the master device to the S-35392A in Read.
*1. 0 : Status register 1 selected, 1 : Status register 2 selected
*2. Set NO_ACK = 1 in Read.
_00
SDA
SCL
SDA
SCL
I/O mode switching
Figure 36 Status Register 1 Access and Status Register 2 Access
I/O mode switching
0
Device code +
1
SDA
1
SCL
0
command
Device code +
1
1
1
command
I/O mode switching
0
1
0
0
1
0
0
1
Figure 34 Real-Time Data 1 Access
Figure 35 Real-Time Data 2 Access
1
0
R/W
Device code +
1
1
command
9
B7
R/W
1
9
0
B7
Seiko Instruments Inc.
Year data
*1
0
Hour data
0
B0
I/O mode switching
B0
R/W
B7
9
18
I/O mode switching
Status data
18
B7
Minute data
B0
I/O mode switching
in Read
18
B0
27
B7
.
2-WIRE REAL-TIME CLOCK
Second data
63
B7
Second data
B0
B0
36
72
S-35392A
31