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参数资料
| 型号： | M48T201V-85MH1E |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封装： | SNAPHAT, ROHS COMPLIANT, PLASTIC, SOIC-44 |
| 文件页数： | 14/37页 |
| 文件大小： | 311K |
| 代理商： | M48T201V-85MH1E |
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M48T201Y, M48T201V
Clock operation
In order to perform a software reset of the watchdog timer, the original timeout period can be
written into the watchdog register, effectively restarting the countdown cycle.
Should the watchdog timer time out, and the WDS bit is programmed to output an interrupt,
a value of 00h needs to be written to the watchdog register in order to clear the IRQ/FT pin.
This will also disable the watchdog function until it is again programmed correctly. A READ
of the flags register will reset the watchdog flag (bit D7; register 7FFF0h).
The watchdog function is automatically disabled upon power-down and the watchdog
register is cleared. If the watchdog function is set to output to the IRQ/FT pin and the
frequency test function is activated, the watchdog or alarm function prevails and the
frequency test function is denied.
Note:
The user must transition the address (or toggle chip enable) to see the flag bit change.
3.7
Square wave output
The M48T201Y/V offers the user a programmable square wave function which is output on
the SQW pin. RS3-RS0 bits located in 7FFF0h establish the square wave output frequency.
These frequencies are listed in Table 7. Once the selection of the SQW frequency has been
completed, the SQW pin can be turned on and off under software control with the square
wave enable bit (SQWE) located in register 7FFF6h.
Table 7.
Square wave output frequency
Square wave bits
Square wave
RS3RS2
RS1RS0
Frequency
Units
000
0
Hi-Z
-
0
1
32.768
kHz
001
0
8.192
kHz
001
1
4.096
kHz
010
0
2.048
kHz
010
1
1.024
kHz
011
0
512
Hz
011
1
256
Hz
100
0
128
Hz
100
1
64
Hz
101
0
32
Hz
101
1
16
Hz
110
0
8
Hz
110
1
4
Hz
111
0
2
Hz
111
1
Hz
相关PDF资料 |
PDF描述 |
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| M48T201Y-70MH1E | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201V-85MH6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MH6 | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MHTR | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-70MH1 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T201V-85MH1F | 功能描述:监控电路 SRAM TK Controller RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| M48T201V-85MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V TIMEKEEPER㈢ supervisor |
| M48T201VMH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
| M48T201VSH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
| M48T201Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
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