S-35390A Seiko Instruments, S-35390A Datasheet - Page 12

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

12
2-WIRE REAL-TIME CLOCK
S-35390A
3. Status Register_2
Status register_2 is an 8-bit register that is used to display and set various modes. The bit configuration is
MSB
shown below.
B7: TEST
B6: INT2AE, B5: INT2ME, B4: INT2FE
B3: 32kE, B2: INT1AE, B1: INT1ME, B0: INT1FE
32kE
0
1
0
0
0
0
0
TEST
R/W
B7
*1. Don’t care (Both of 0 and 1 are acceptable).
INT2AE
0
*1
*1
*1
1
INT1AE
INT2AE
These flags are used to select the output mode from the INT1 pin. Mode selections
are shown below. When using the alarm 1 function, after setting the alarm interrupt
mode, access INT1 register_1.
The TEST flag is a bit for testing the IC. If the TEST flag is set to “1”, the IC is
switched to the TEST mode. If this flag is “1”, it is necessary to initialize it to “0” by
setting the reset flag of status register_1 to “1”.
These flags are used to select the output mode from the INT2 pin. Mode selections
are shown below. When using the alarm 2 function, after setting the alarm interrupt
mode, access INT1 register_2.
*1
*1
*1
0
0
1
1
*1. Don’t care (Both of 0 and 1 are acceptable).
R/W
B6
INT2ME
0
0
1
1
0
INT1ME
INT2ME
*1
0
0
1
1
0
1
R/W
Table 10 Interrupt Modes (
Table 11 Interrupt Modes (
B5
INT2FE
Figure 10 Status Register_2
0
1
0
1
0
Seiko Instruments Inc.
INT1FE
INT2FE
0
*1
1
0
1
0
1
R/W
B4
No interrupt
Selected frequency steady interrupt
Per-minute edge interrupt
Per-minute steady interrupt 1 (50% duty)
Alarm interrupt
No interrupt
32 kHz output
Selected frequency steady interrupt
Per-minute edge interrupt
Per-minute steady interrupt 1 (50% duty)
Alarm interrupt
Per-minute steady interrupt 2
32kE
R/W
B3
INT2 Pin Output Mode
INT1 Pin Output Mode
INT )
INT )
INT1AE
R/W
B2
2
1
R/W:
Read/write-enabled
INT1ME
R/W
B1
INT1FE
R/W
B0
Rev.1.2
LSB
_00