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參數(shù)資料
| 型號： | S-3531A |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | CMOS Real-Time Clock IC Supporting an IIC-Bus(支持IIC-BUS的CMOS實時時鐘芯片) |
| 中文描述： | CMOS實時時鐘IC支持一個IIC總線（支持IIC總線的實時時鐘芯片的CMOS） |
| 文件頁數(shù)： | 12/31頁 |
| 文件大?。?/td> | 185K |
| 代理商： | S-3531A |
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REAL-TIME CLOCK
S-3531A
Seiko Instruments Inc.
11
32 kHz
Example
If f15 to f0 = 000AH
16 kHz
8 kHz
4 kHz
2 kHz
INT1 terminal output
Figure 13 Clock output
2-4. Test flag
The test flag is a one-bit register which is assigned to MSB of the second data of the real-time data register.
If a transferred data is considered as the test mode starting data due to the receiving of the test mode starting
data or noises, "1" is set. When "1" is set, you must send the test mode ending command or reset command.
3. Initialization
Note that S-3531A has different initializing operations, depending on states.
3-1. When power is turned on
When power is turned on, the status register is set to "82h" and the INT1 register to "8000h" by the power-on
detecting circuit. In other words, "1" is sets at the bit 7 (POWER flag) of the status register and the clock of 1 Hz
is output from the INT1 terminal. This is provided to adjust oscillating frequencies. In normal use, the reset
command must be sent when power is turned on.
Real-time data register
: 00 (year), 01 (month), 01 (day), 0 (day of week), 00 (hour), 00 (minute), 00
(second)
Status register
: "82h"
INT1 register : "8000h"
3-2.When the power voltage detecting circuits operates
The power voltage detecting circuit included in S-3531A operates and sets "1" at the bit 7 (POWER flag) of
the internal status register when power is turned on or power voltage is reduced. Once "1" is set, it is held even
after the power voltage gets equal to or higher than the detected power voltage. When the flag has "1", you must
send the reset command from CPU and initialize the flag. At this point, other registers does not change.
However, if the POWER flag has "0" during the power-on reset of CPU (S-3531A does not reach any indefinite
area during backup), you do not have to send the reset command.
3-3. When the reset command is received
When the reset command is received, each register turns as follows:
Real-time data register
: 00 (year), 01 (month), 01 (day), 0 (day of week), 00 (hour), 00 (minute), 00
(second)
Status register
: "00h"
INT1 register : "0000h"
Set to frequency
duty mode
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