參數(shù)資料
型號(hào): M48T128V-85CS1
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: 0 TIMER(S), REAL TIME CLOCK, PDSO44
封裝: PLASTIC, SO-44
文件頁數(shù): 23/30頁
文件大小: 162K
代理商: M48T128V-85CS1
3/30
M48T129Y, M48T129V
CLOCK OPERATIONS . . . .... ... . . . . . . . . ... .. . . ... . . . .... . . . .... .... .. . . . . . . . . .... . 16
Reading the Clock . . . . . . . . . . . . . . . . . . . . . . ... . . . . ... .. ... .. .. ... .. . ... .. . . ... . . . . . 16
Setting the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... ... . ... . . .. .. .. .. . . . . . . ... . .... 16
TIMEKEEPER
Registers. . . . . . .... . ... .. .. ... ... . . . . . . . . ... .. . . ... . ... . . . . ... ... 16
TIMEKEEPER
Register Map (Table 11.) . . . . . . . .... .... .. . . . . . . . . . . . . . ... .. . . . . .... 17
Setting the Alarm Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Alarm Interrupt Reset Waveform (Figure 13.) . . . . . . . . . . . .... .... ... . . . . . . . . ... .. . . ... . 19
Alarm Repeat Mode (Table 12.) . . . . . . . . . . . . . . .... . ... .. . . . . .... . . . . .. . . . . . . . . .... . 19
Back-up Mode Alarm Waveforms (Figure 14.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... . ... .. .20
Stopping and Starting the Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Calibrating the Clock . . . . . . .... . . .. .. .. .. . . . . . . . . . . . . . ... . . . . . . . . . ... .. .. ... .. . ..18
Watchdog Timer . .... . . . .... .... .. . .... .. . .... . ... .. .. .. .... . . . ... . . . . . . . . . . . . . 20
Power-on Reset. . . . . . . . . . . . . . . . . . . . . .... . ... .. .. .. . . . . . . . . . . . . ... . . . .... . ... .. .21
Battery Low Warning . . .... ... . ... .. . . ... .. . .... . ... .. . . . . .... . . . . .. . . . . . . . . .... . 21
Initial Power-on Defaults . . . .... . . .. .. .. .. . . . . . . . . . . . . . ... . . . . . . . . . ... .. .. ... .. . ..21
Crystal Accuracy Across Temperature (Figure 15.) .... .... .. . . . . . . . . . . . . . ... .. . . . . .... 21
Calibration Waveform (Figure 16.) . . . .... . . ... .. .... ... . . . . . . . . . . . . . . . . . .. . ... .. ... 22
Power Supply Decoupling and Undershoot Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Supply Voltage Protection (Figure 17.) . . . . . . ... . . . . . . . . . ... .. .. ... .. .. . . .. . . ... .. ... 22
PART NUMBERING . . . . . . . . . .... . . .. .. .. .. . . . . . . . . . . . . . ... . . . . . . . . . ... .. .. ... .. . ..23
SNAPHAT Battery Table (Table 14.). . . . . . . . . . . . . . ... . . . . . . . . . . . . . ... . ... . . .. .. .. .. .23
PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... . ... ... 24
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . .... . . . ... . . . . . . . . . . . . . ... ... . . . .... 29
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