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参数资料
| 型号： | M48T59V-70MH6TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.330 INCH, PLASTIC, SOH-28 |
| 文件页数： | 7/29页 |
| 文件大小： | 440K |
| 代理商： | M48T59V-70MH6TR |
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M48T59, M48T59Y, M48T59V*
Setting the Alarm Clock
Registers 1FF5h-1FF2h contain the alarm set-
tings. The alarm can be configured to go off at a
prescribed time on a specific day of the month or
repeat every month, day, hour, minute, or second.
It can also be programmed to go off while the
M48T59/Y/V is in the battery back-up mode of op-
eration to serve as a system wake-up call.
Bits RPT1-RPT4 put the alarm in the repeat mode
of operation. Table 6, page 15 shows the possible
configurations. Codes not listed in the table default
to the once per second mode to quickly alert the
user of an incorrect alarm setting.
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 the
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 as
shown in Figure 12, page 15. A subsequent READ
of the Flags Register is necessary to see that the
value of the Alarm Flag has been reset to '0.'
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 the ABE (Alarm in Battery
Back-up Mode Enable) and the 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/Y/V was in the dese-
lect mode during power-down. Figure 13, page 16
illustrates the back-up mode alarm timing.
Figure 12. Alarm Interrupt Reset Waveform
Table 6. Alarm Repeat Mode
RPT4
RPT3
RPT2
RPT1
Alarm Activated
1111
Once per Second
1110
Once per Minute
1100
Once per Hour
1000
Once per Day
0000
Once per Month
AI01388B
15ns Min
A0-A12
ACTIVE FLAG BIT
IRQ/FT
ADDRESS 1FF0h
HIGH-Z
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| M48T59Y-70MH6F | REAL TIME CLOCK, PDSO28 |
| M48T86MH1E | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M4T32-BR12SH1 | 1 TIMER(S), REAL TIME CLOCK, DSS4 |
| M50734FP-10 | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP72 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T59V-70PC1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V, 64 Kbit (8 Kbit x 8) TIMEKEEPER? SRAM |
| M48T59V-70PC1E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V, 64 Kbit (8 Kbit x 8) TIMEKEEPER? SRAM |
| M48T59V-70PC1F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V, 64 Kbit (8 Kbit x 8) TIMEKEEPER? SRAM |
| M48T59V-70PC1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59V-70PC6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM |
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