參數(shù)資料
型號(hào): M48T212A-85MH6
廠商: STMICROELECTRONICS
元件分類(lèi): 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述: 0 TIMER(S), REAL TIME CLOCK, PDSO44
封裝: HATLESS, PLASTIC, SOIC-44
文件頁(yè)數(shù): 23/30頁(yè)
文件大?。?/td> 155K
代理商: M48T212A-85MH6
3/30
M48T212A
CLOCK OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... ... .... ... .18
TIMEKEEPER
Registers. . . .... ... ... .. . ... . . . . . . ... ... . . . . ... . . . . ... .. . ... . . ...18
Reading the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... ... .... ... . . . . . . ... . . ...18
Setting the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... ... .. . . . . . . ... .... ... .... .. .. 18
Stopping and Starting the Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... ... .... . . . . 18
TIMEKEEPER
Register Map (Table 13.) . . . .... . . . ... .. . ... . . . . ... . . . . . . . . . . . . . . . . . 19
Calibrating the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Setting the Alarm Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... . . . .... 21
Alarm Interrupt Reset Waveforms (Figure 10.) . . . . . . . . . . . . . . . . . . . . . . . . . .... ... .... ... .21
Alarm Repeat Modes (Table 14.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Back-up Mode Alarm Waveforms (Figure 11.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... 22
Watchdog Timer . . . . . . . . . . . . . . . . . . . . . . . .... ... . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . 22
VCC Switch Output. . .... ... .. . . . . . .... ... . . .. .. ... . . . . . . . . . . . . . . . ... . . . . . . . . . . . . 23
Power-on Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... ... .... ... .23
(RSTIN1 & RSTIN2) Timing Waveforms (Figure 12.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... 23
Reset AC Characteristics (Table 15.) . . . . . . . . . . . . . . . . . . . . ... . . . . . . ... .... ... .... ... .23
Battery Low Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Initial Power-on Defaults . . . . . . . . . . .... ... ... ..... . . . ... . ... ... . ... .. .. ... .. .. ... .24
Default Values (Table 16.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Crystal Accuracy Across Temperature (Figure 13.) .... . . . ... . ... ... . ... .. .. ... .. .. ... .25
Calibration Waveform (Figure 14.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
VCC Noise And Negative Going Transients. . . . . . . . . . . . . . . .... ... .... ... ... .. . ... . . ...26
Supply Voltage Protection (Figure 15.) . . . . . . . .... .. ... . . . . . . . . . . . . . . . ... . . . . . .... .. .26
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... . . . .... 27
PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
REVISION HISTORY. .... . ... ... .. . . . . .. ... .. .. ... . ... ... . ... ... . . . . . . ... . . . . . . .... 29
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