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参数资料
| 型号： | RTC-7301SFB |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO24 |
| 封装： | SSOP-24 |
| 文件页数： | 3/28页 |
| 文件大小： | 274K |
| 代理商： | RTC-7301SFB |
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RTC - 7301 SF / DG
Page - 8
MQ332-05
6-2. Register description
6-2-1. Clock and calendar registers ( Bank0, Reg-0 to Reg-E )
Data is in BCD format. For example, if the 10 second register is “0101” and the 1 second register is “1001” it has the
meaning of 59 seconds.
The clock keeps time using a 24 hour format.
Leap years are automatically determined between the years of 1901 and 2099.
Days are in Bank 0 Reg-6.
Day registers are in 3 bits from bit 0 to 2 and are allocated as shown in the following table.
Bit 2
bit 1
bit 0
Day
0
Sun.
0
1
Mon.
0
1
0
Tues.
0
1
Wed.
1
0
Thurs.
1
0
1
Fri.
1
0
Sat.
Fos (Oscillation voltage decrease detection bit)
This flag is a bit for recording the decrease in voltage on the crystal oscillator.
It detects the decrease in the voltage
of the crystal oscillator that is in use and is a flag bit for notifying the decrease in the reliability of the time data.
“1” indicates a decrease in the voltage and it is retained until a “0” is written.
This is not affected by the function of other bits.
6-2-2. Alarm register
( Bank1 Reg-0 to Reg-8 and Reg-E )
AE bit: ( Alarm Enable )
This bit enables the setting of the alarms for date, day, hour, minute and second.
An AE bit accompanies the alarm register, so using this bit makes it easy to set the alarm for each second, each
minute, each hour, each day or each date.
It is not possible to set a multiple of days at one time.
When the AE bit is 0, the appropriate register and the clock register are compared; when the bit is 1, this means "don't
care" and the data is ignored and the two are regarded as the same.
Example of setting day alarm bits for each day ( Bank1 Reg-6 )
bit 2
bit 1
bit 0
Day
0
Sun.
0
1
Mon.
0
1
0
Tues.
0
1
Wed.
1
0
Thurs.
1
0
1
Fri.
1
0
Sat.
AF bit: ( Alarm Flag )
The AF bit is “1” when an alarm occurs.
This data is retained until a “0” is written.
It is not possible to write “1.”
AIE bit: ( Alarm Interrupt Enable )
This bit sets whether or not to output the alarm interrupt signal to the /IRQ pin.
The /IRQ pin is Low active when the AF bit is set to 1 at the time of an alarm interrupt, if the AIE bit is “1.”
An alarm interrupt output is prohibited from the /IRQ pin when the AIE bit is “0.”
It is necessary to set the AIE bit to “1” in order to have an alarm interrupt.
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相关代理商/技术参数 |
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| RTC-840 | 制造商:AAEON 制造商全称:AAEON 功能描述:Intel?? Corea?￠ Duo U2500 1.2 GHz Processor |
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| RTC-8563SA | 制造商:EPSONTOYOCOM 制造商全称:Epson ToYoCom 功能描述:RTC-8563SA |
| RTC-8563SJE | 制造商:EPSONTOYOCOM 制造商全称:Epson ToYoCom 功能描述:RTC-8563SA |
| RTC-8564JE | 制造商:Epson Toyocom Corporation 功能描述:32.768kHz 275nA@3ViTyp.j 3.0V (typ.) 7.0~5.4~1.5mm +85 -40 5}23ppm@+25/3.0V 7mm 5.4mm 1.5mm 制造商:Epson Toyocom Corporation 功能描述:RTC I2C BUS INTERFACE SMD VSOJ-20 制造商:Epson Toyocom Corporation 功能描述:RTC I2C BUS INTERFACE, SMD, VSOJ-20 制造商:Epson Toyocom Corporation 功能描述:IC, RTC, FULL CALENDAR, VSOJ-20; Clock Format:12Hr / 24Hr; Clock IC Type:RTC; Supply Voltage Min:1.8V; Supply Voltage Max:5.5V; Digital IC Case Style:VSOJ; No. of Pins:20; IC Interface Type:I2C; Operating Temperature Min:-40C ;RoHS Compliant: Yes 制造商:Epson Toyocom 功能描述:RTC module,I2C Bus,Alarm,timer func |
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