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参数资料
| 型号： | M48T59Y-70MH1F |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.330 INCH, LEAD FREE, PLASTIC, SOH-28 |
| 文件页数： | 9/32页 |
| 文件大小： | 373K |
| 代理商： | M48T59Y-70MH1F |
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M48T59, M48T59Y, M48T59V
Clock operations
Figure 11.
Back-up mode alarm waveforms
3.6
Watchdog timer
The watchdog timer can be used to detect an out-of-control microprocessor. The user
programs the watchdog timer by setting the desired amount of time-out into the eight-bit
Watchdog Register (Address 1FF7h). The five bits (BMB4-BMB0) that store a binary
multiplier and the two lower order bits (RB1-RB0) select the resolution, where 00 = 1/16
second, 01 = 1/4 second, 10 = 1 second, and 11 = 4 seconds. The amount of time-out is
then determined to be the multiplication of the five-bit multiplier value with the resolution.
(For example: writing 00001110 in the Watchdog Register = 3 x 1 or 3 seconds).
Note:
Accuracy of timer is within ± the selected resolution.
If the processor does not reset the timer within the specified period, the M48T59/Y/V sets
the WDF (Watchdog Flag) and generates a watchdog interrupt or a microprocessor reset.
WDF is reset by reading the Flags Register (Address 1FF0h).
Note:
User must transition address (or toggle chip enable) to see Flag Bit change.
The most significant bit of the Watchdog Register is the Watchdog Steering Bit. When set to
a '0,' the watchdog will activate the IRQ/FT pin when timed-out. When WDS is set to a '1,'
the watchdog will output a negative pulse on the RST pin for a duration of trec. The
Watchdog Register, the FT Bit, and the AFE and ABE Bits will reset to a '0' at the end of a
watchdog time-out when the WDS bit is set to a '1.'
The watchdog timer resets when the microprocessor performs a re-write of the Watchdog
Register. The time-out period then starts over. The watchdog timer is disabled by writing a
value of 00000000 to the eight bits in the Watchdog Register.
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.
AI03254B
VCC
IRQ/FT
trec
VPFD (max)
VPFD (min)
ABE, AFE bit in Interrupt Register
AF bit in Flags Register
HIGH-Z
VSO
HIGH-Z
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T59Y-70MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59Y-70MH6 | 功能描述:实时时钟 R 511-M48T59Y-70MH6E RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| M48T59Y-70MH6E | 功能描述:实时时钟 64K (8Kx8) 70ns RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| M48T59Y-70MH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59Y-70PC1 | 功能描述:实时时钟 64K (8Kx8) 70ns RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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