- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄359066 > M48T59V-70MH1 (意法半導(dǎo)體) 64 Kbit 8Kb x8 TIMEKEEPER SRAM PDF資料下載
參數(shù)資料
| 型號(hào)： | M48T59V-70MH1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| 中文描述： | 64千位8KB的x8 SRAM的計(jì)時(shí)器 |
| 文件頁(yè)數(shù)： | 13/21頁(yè) |
| 文件大?。?/td> | 168K |
| 代理商： | M48T59V-70MH1 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)當(dāng)前第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)
13/21
M48T59, M48T59Y, M48T59V
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 RPT1-RPT4, AF (Alarm Flag) is set. If AFE
(Alarm Flag Enable) is also set, the alarm condi-
tion activates the IRQ/FT pin. To disable alarm,
write ‘0’ to the Alarm Date register and RPT1-4.
The alarm flag and the IRQ/FT output are cleared
by a read to the Flags register.
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. The user can read the Flag Register at system
boot-up to determine if an alarm was generated
while the M48T59 was in the deselect mode during
power-up. Figure 12 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 eight bit Watchdog Register (Ad-
dress 1FF7h). The five bits (BMB4-BMB0) store a
binary multiplier and the two lower order bits (RB1-
RB0) select the resolution, where 00 = 1/16 sec-
ond, 01 = 1/4 second, 10 = 1 second, and 11 = 4
seconds. The amount of time-out is then deter-
mined to be the multiplication of the five bit multi-
plier value with the resolution. (For example:
writing 00001110 in the Watchdog Register = 3 x 1
or 3 seconds).
Note:
Accuracy of timer is within ± the selected
resolution.
If the processor does not reset the timer within the
specified period, the M48T59 sets the WDF
(Watchdog Flag) and generates a watchdog inter-
rupt or a microprocessor reset.
WDF is reset by reading the Flags Register (Ad-
dress 1FFOh).
Figure 12. Back-up Mode Alarm Waveforms
AI03254B
VCC
VPFD (max)
VPFD (min)
IRQ/FT
tREC
ABE, AFE bit in Interrupt Register
AF bit in Flags Register
HIGH-Z
VSO
HIGH-Z
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M48T59YSH | Hook-Up Wire; Conductor Size AWG:24; No. Strands x Strand Size:Solid; Jacket Color:Green; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes |
| M48T59VMH | 64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59PC | 64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59V-70MH6TR | 64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59V-70PC1 | 64 Kbit 8Kb x8 TIMEKEEPER SRAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T59V-70MH1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V, 64 Kbit (8 Kbit x 8) TIMEKEEPER? SRAM |
| M48T59V-70MH1F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V, 64 Kbit (8 Kbit x 8) TIMEKEEPER? SRAM |
| M48T59V-70MH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59V-70MH6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59V-70MH6TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。