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參數(shù)資料
| 型號： | M48T201Y-70MHTR |
| 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： | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封裝： | PLASTIC, SOIC-44 |
| 文件頁數(shù)： | 34/35頁 |
| 文件大?。?/td> | 688K |
| 代理商： | M48T201Y-70MHTR |
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M48T201Y, M48T201V
8/33
READ Mode
The M48T201Y/V executes a READ Cycle when-
ever W (WRITE Enable) is high and E (Chip En-
able) is low. The unique address specified by the
address inputs (A0-A18) defines which one of the
on-chip TIMEKEEPER registers or external
SRAM locations is to be accessed. When the ad-
dress presented to the M48T201Y/V is in the
range of 7FFFFh-7FFF0h, one of the on-board
TIMEKEEPER registers is accessed and valid
data will be available to the eight data output driv-
ers within tAVQV after the address input signal is
stable, providing that the E and G access times
are also satisfied. 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 one of the on-chip TIMEKEEPER reg-
isters is selected for READ, the GCON signal will
remain inactive throughout the READ Cycle.
When
the
address value
presented to the
M48T201Y/V is outside the range of TIMEKEEP-
ER registers, an external SRAM location will be
selected. In this case the G signal will be passed
to the GCON pin, with the specified delay times of
tAOEL or tOERL.
Figure 5. GCON Timing When Switching Between RTC and External SRAM
AI02333
G
E
GCON
tAOEL
ADDRESS
00000h - 7FFEFh
7FFF0h - 7FFFFh
00000h - 7FFEFh
7FFF0h - 7FFFFh
tAOEH
tOERL
tRO
External SRAM
RTC
External SRAM
RTC
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| M48T212V-70MH1 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-70MH6TR | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-70MH6 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-70MH1TR | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-85MH6 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T201Y-80MH1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-85MH1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3V TIMEKEEPER㈢ supervisor |
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