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参数资料
| 型号： | M48T212Y-70MH6 |
| 厂商： | 意法半导体 |
| 英文描述： | Shielded Multiconductor Cable; Number of Conductors:5; Conductor Size AWG:24; No. Strands x Strand Size:7 x 32; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes; Conductor Material:Copper; Temperature Max:80 C RoHS Compliant: Yes |
| 中文描述： | 5V/3.3V计时[控制器 |
| 文件页数： | 14/23页 |
| 文件大小： | 150K |
| 代理商： | M48T212Y-70MH6 |
M48T212Y, M48T212V
14/23
Stopping and Starting the Oscillator
The oscillator may be stopped at any time. If the
device is going to spend a significant amount of
time on the shelf, the oscillator can be turned off to
minimize current drain on the battery. The STOP
bit islocated at Bit D7 within the Seconds Register
(9h). Setting it toa ‘1’stops theoscillator. Whenre-
set toa ‘0’, theM48T212Y/V oscillator starts within
one second.
Note:
It is not necessary to set the WRITE bit
when setting or resetting the FREQUENCY TEST
bit (FT) or the STOP bit (ST).
SETTING ALARM CLOCK
Address locations 6h-2h contain the alarm set-
tings. The alarm can be configured to go off at a
prescribed time on a specific month, date, hour,
minute, or second or repeat every year, month,
day, hour, minute, or second. It can also be pro-
grammed to go off while the M48T212Y/V isin the
battery back-upto serve asa system wake-upcall.
Bits RPT5-RPT1 putthe alarm in the repeat mode
of operation. Table 12 shows the possible config-
urations. Codesnot listed in the tabledefault to the
once per second mode to quickly alert the user of
an incorrect alarm setting.
Note
: User must transition address (or toggle chip
enable) to see Flag bit change.
When the clock information matches the alarm
clock settings based on the match criteria defined
by RPT5-RPT1, the AF (Alarm Flag) is set.
If AFE (Alarm Flag Enable) is also set, the alarm
condition activates the IRQ/FT pin. To disable
alarm, write ’0’ to the Alarm Date registers and
RPT1-4. The IRQ/FT output is cleared by a read to
the Flags register as shown in Figure 9. A subse-
quent read of the Flags register will reset the
Alarm Flag (D6; Register 0h).
The IRQ/FT pin can also be activated in the bat-
tery back-up mode. The IRQ/FT will go low if an
alarm occurs and both ABE (Alarm in Battery
Back-up Mode Enable) and AFE are set. The ABE
and AFE bits are reset during power-up, therefore
an alarm generated during power-up will only set
AF. Theuser can read the Flag Register at system
boot-up to determine if an alarm was generated
while the M48T212Y/V was in the deselect mode
during power-up. Figure 10 illustrates the back-up
mode alarm timing.
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 Watchdog Register, address 7h.
Bits BMB4-BMB0 store a binary multiplier and the
two lower order bits RB1-RB0 select the resolu-
tion, where00=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 Reg-
ister = 3*1 or 3 seconds).
Note
: Accuracy of timer is within
±
the selected
resolution.
If theprocessor does not reset the timer within the
specified period, the M48T212Y/V sets the WDF
(Watchdog Flag) and generates a watchdog inter-
rupt or a microprocessor reset. WDF is reset by
reading the Flags Register (Address 0h).
The most significant bit of the Watchdog Register
is the Watchdog Steering Bit (WDS). 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 40 to 200 ms. The Watchdog register and
the FT bit will reset to a ‘0’ at the end of a Watch-
dog time-out when the WDS bit is set to a ‘1’.
The watchdog timer can be reset by two methods:
1. a transition (high-to-low or low-to-high) can be
applied to the Watchdog Input pin (WDI) or
2. the microprocessor can perform a write of the
Watchdog Register.
The time-out period then starts over. The WDI pin
should be tied to V
SS
if not used. The watchdog
will be reset on each transition (edge) seen by the
WDI pin. In the order to perform a software reset
of the watchdog timer, the original time-out period
can be written into the Watchdog Register, effec-
tively restarting the count-down cycle.
Should the watchdog timer time-out,and theWDS
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 dis-
able the watchdog function until it is again pro-
grammed correctly. A read of the Flags Register
will reset theWatchdog Flag (Bit D7; Register 0h).
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.
相关PDF资料 |
PDF描述 |
|---|---|
| M48T212Y-70MH6TR | Shielded Multiconductor Cable; Number of Conductors:5; Conductor Size AWG:24; No. Strands x Strand Size:7 x 32; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes; Conductor Material:Copper; Temperature Max:80 C RoHS Compliant: Yes |
| M48T212YSH | Hook-Up Wire; Conductor Size AWG:24; No. Strands x Strand Size:Solid; Jacket Color:Red; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Conductor Plating:Tin RoHS Compliant: Yes |
| M48T212Y-85MH6TR | 5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y | 5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212YMH | 5V/3.3V TIMEKEEPER[ CONTROLLER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T212Y-70MH6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212Y-70MH6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212Y-70MH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y-85MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y-85MH1E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
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