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參數(shù)資料
| 型號(hào)： | M48T86MH1E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封裝： | 0.330 INCH, ROHS COMPLIANT, PLASTIC, SOH-28 |
| 文件頁數(shù)： | 10/36頁 |
| 文件大?。?/td> | 352K |
| 代理商： | M48T86MH1E |
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Obsolete
Product(s)
- Obsolete
Product(s)
Clock operations
M48T86
should avoid interrupt service routines that would cause the time needed to read valid
time/calendar data to exceed 244 s.
The third method uses a periodic interrupt to determine if an update cycle is in progress.
The UIP bit is set high between the setting of the PF bit (Register C; Bit 6). Periodic
interrupts that occur at a rate greater than tBUC allow valid time and date information to be
reached at each occurrence of the periodic interrupt.The READs should be completed
within 1/(tPL/2 + tBUC) to ensure that data is not read during the update cycle.
3.9
Square wave output selection
Thirteen of the 15 divider taps are made available to a 1-of-15 selector, as shown in the
block diagram of Figure 4 on page 8. The purpose of selecting a divider tap is to generate a
square wave output signal on the SQW pin. The RS3-RS0 bits in Register A establish the
square wave output frequency. These frequencies are listed in Table 4 on page 18. The
SQW frequency selection shares the 1-of-15 selector with the periodic interrupt generator.
Once the frequency is selected, the output of the SQW pin can be turned on and off under
program control with the Square Wave Enabled (SQWE) bit.
Table 4.
Square wave frequency/periodic interrupt rate
Register A bits
Square wave
Periodic interrupt
RS3
RS2
RS1
RS0
Frequency
Units
Period
Units
0000
None
0001
256
Hz
3.90625
ms
0010
128
Hz
7.8125
ms
0011
8.192
kHz
122.070
us
0100
4.096
kHz
244.141
us
0101
2.048
kHz
488.281
us
0110
1.024
kHz
976.5625
us
0111
512
Hz
1.953125
ms
1000
256
Hz
3.90625
ms
1001
128
Hz
7.8125
ms
1010
64
Hz
15.625
ms
1011
32
Hz
31.25
ms
1100
16
Hz
62.5
ms
1101
8
Hz
125
ms
1110
4
Hz
250
ms
1111
2
Hz
500
ms
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T86MH1F | 功能描述:實(shí)時(shí)時(shí)鐘 5 Volt PC Drop-In RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M48T86MH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 V PC real-time clock |
| M48T86PC | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V PC REAL TIME CLOCK |
| M48T86PC1 | 功能描述:實(shí)時(shí)時(shí)鐘 5 Volt PC Drop-In RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M48T86PC1 | 制造商:STMicroelectronics 功能描述:IC - Real Time Clock |
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