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參數(shù)資料
| 型號(hào)： | M48T212A-85MH1TR |
| 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： | HATLESS, PLASTIC, SOIC-44 |
| 文件頁數(shù)： | 4/30頁 |
| 文件大?。?/td> | 155K |
| 代理商： | M48T212A-85MH1TR |
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M48T212A
12/30
READ Mode
The M48T212A executes a READ cycle whenever
W (WRITE Enable) is high and E (Chip Enable) is
low. The unique address specified by the address
inputs (A3-A0) defines which one of the on-chip
TIMEKEEPER registers is to be accessed. When
the address presented to the M48T212A is in the
range of 0h-Fh, one of the on-board TIMEKEEP-
ER registers is accessed and valid data will be
available to the eight data output drivers within
tAVQV after the address input signal is stable, pro-
viding that the E and G access times are also sat-
isfied. If they are not, then data access must be
measured from the latter occurring signal (E or G)
and the limiting parameter is either tELQV for E or
tGLQV for G rather than the address access time.
When EX input is low, an external SRAM location
will be selected.
Note: Care should be taken to avoid taking both E
and EX low simultaneously to avoid bus conten-
tion.
Figure 7. READ Cycle Timing: RTC Control Signal Waveforms
Note: EX is assumed High.
AI02640
W
DQ7-DQ0
G
DATA OUT
VALID
ADDRESS
tAVAV
E
tELQV
tAVAV
READ
WRITE
DATA IN
VALID
DATA OUT
VALID
tAVQV
tWHAX
tAVWL
tELQX
tGLQV
tGHQZ
tWLWH
tAXQX
tGLQX
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M48T212A-85MH6 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-85MH1F | REAL TIME CLOCK, PDSO44 |
| M48T212V-85MH1E | REAL TIME CLOCK, PDSO44 |
| M48T35V-10PC1 | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
| M48T35V-10MH1 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T212A-85MH6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V TIMEKEEPER CONTROLLER |
| M48T212A-85MH6TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V TIMEKEEPER CONTROLLER |
| M48T212AMH | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V TIMEKEEPER CONTROLLER |
| M48T212V | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V TIMEKEEPER supervisor |
| M48T212V_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V TIMEKEEPER supervisor |
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