s-35199a01 Seiko Instruments Inc., s-35199a01 Datasheet - Page 16

• Manufacturer Part Number: s-35199a01
• Description: 3-wire Real-time Clock
• Manufacturer: Seiko Instruments Inc.

16
3-WIRE REAL-TIME CLOCK
S-35199A01
3. Status Register 2
B0 : TEST
B1 : INT2AE
B2, B3 : SC3, SC2
B4 : 32kE, B5 : INT1AE, B6 : INT1ME, B7 : INT1FE
Status register 2 is a 1-byte register that is used to display and set various modes. The bit configuration is shown below.
*1. Don’t care (Both of 0 and 1 are acceptable).
Caution Note that alarm 2 interrupt is output from the INT pin regardless of the settings in flags B4 to B7.
This is a test flag for SII. Be sure to set this flag to “0” in use. If this flag is set to “1”, be sure to initialize to set “0”.
This is an enable bit for alarm 2 interrupt. When this bit is “0”, alarm 2 interrupt is disabled. When it is “1”, it is enabled.
To use alarm 2 interrupt, access the INT register 2 and the alarm expansion register 2 after enabling this flag.
These are 2-bit SRAM type registers that can be freely set by users.
These bits are used to select the output mode for the INT pin. Table 10 shows how to select the mode. To use alarm
1 interrupt, access the INT register 1 and the alarm expansion register 1, after setting the alarm 1 interrupt mode.
32kE
0
0
0
0
0
0
1
INT1FE
R/W
B7
INT1AE
INT1ME
R/W
−
−
−
B6
0
0
1
1
*1
*1
*1
INT1AE
R/W
B5
INT1ME
Table 10 Output Modes for INT Pin
−
0
0
1
1
0
1
*1
Figure 16 Status Register 2
Seiko Instruments Inc.
32kE
R/W
B4
INT1FE
−
0
1
0
1
0
1
*1
R/W
SC2
B3
No interrupt
Output of user-set frequency
Per-minute edge interrupt
Minute-periodical interrupt 1 (50% duty)
Alarm 1 interrupt
Minute-periodical interrupt 2
32.768 kHz output
R/W:
SC3
R/W
B2
Read/Write
INT Pin Output Mode
INT2AE
B1
R/W
TEST
R/W
B0
Rev.1.0
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