|
S-35392A Datasheet, PDF (12/47 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK | |||
|
◁ |
2-WIRE REAL-TIME CLOCK
S-35392A
Rev.1.3_00
2. Status register 1
Status register 1 is a 1-byte register that is used to display and set various modes. The bit configuration is shown below.
B7
B6
B5
B4
B3
B2
B1
B0
RESET 12 / 24
SC0
SC1
INT1
INT2
BLD
POC
W
R/W
R/W
R/W
R
R
R
R
R:
W:
R/W:
Read
Write
Read/Write
Figure 10 Status Register 1
B0 : POC
This flag is used to confirm whether the power is on. The power-on detector operates at power-on and B0 is set to â1â.
This flag is Read-only. Once it is read, it is automatically set to â0â. When this flag is â1â, be sure to initialize. Regarding
the operation after power-on, refer to â Power-on Detection Circuit and Register Statusâ.
B1 : BLD
This flag is set to â1â when the power supply voltage decreases to the level of detection voltage (VDET) or less. Users
can detect a drop in the power supply voltage. This flag is set to â1â once, is not set to â0â again even if the power
supply increases to the level of detection voltage (VDET) or more. This flag is Read-only. When this flag is â1â, be sure
to initialize. Regarding the operation of the power supply voltage detection circuit, refer to â Low Power Supply
Detection Circuitâ.
B2 : INT2, B3 : INT1
This flag indicates the time set by alarm and when the time has reached it. This flag is set to â1â when the time that
users set by using the alarm function has come. The INT1 flag in â1â in the alarm 1 function mode, the INT2 flag in â1â
in the alarm 2 interrupt mode. This flag is Read-only. This flag is read once, is set to â0â automatically.
B4 : SC1, B5 : SC0
These flags are SRAM type registers, they are 2 bits as a whole, can be freely set by users.
B6 : 12 / 24
This flag is used to set 12-hour or 24-hour expression.
0 : 12-hour expression
1 : 24-hour expression
B7 : RESET
The internal IC is initialized by setting this bit to â1â. This bit is Write-only. It is always â0â when Read. When applying
the power supply voltage to the IC, be sure to write â1â to this bit to initialize the circuit. Regarding each status of data
after initialization, refer to â Register Status After Initializationâ.
12
Seiko Instruments Inc.
|
▷ |