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參數(shù)資料
| 型號： | M41T81SMY6F |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Serial Access Real-Time Clock with Alarms |
| 中文描述： | 串行訪問實(shí)時時鐘與鬧鐘 |
| 文件頁數(shù)： | 15/29頁 |
| 文件大小： | 438K |
| 代理商： | M41T81SMY6F |
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M41T81S
Setting Alarm Clock Registers
Address locations 0Ah-0Eh contain the alarm set-
tings. The alarm can be configured to go off at a
prescribed time on a specific month, date, hour,
minute, or second or repeat every year, month,
day, hour, minute, or second. It can also be pro-
grammed to go off while the M41T81S is in the
battery back-up mode to serve as a system wake-
up call.
Bits RPT5-RPT1 put the alarm in the repeat mode
of operation.
Table 3., page 16
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.
When the clock information matches the alarm
clock settings based on the match criteria defined
by RPT5-RPT1, the AF (Alarm Flag) is set. If AFE
(Alarm Flag Enable) is also set (and SQWE is '0.'),
the alarm condition activates the IRQ/FT/OUT/
SQW pin.
Note:
If the address pointer is allowed to incre-
ment to the Flags Register address, an alarm con-
dition will not cause the Interrupt/Flag to occur until
the address pointer is moved to a different ad-
dress. It should also be noted that if the last ad-
dress written is the “Alarm Seconds,” the address
pointer will increment to the Flag address, causing
this situation to occur.
The IRQ/FT/OUT/SQW output is cleared by a
READ to the Flags Register as shown in Figure
14
. 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/OUT/SQW pin can also be activated
in the battery back-up mode. The IRQ/FT/OUT/
SQW will go low if an alarm occurs and both ABE
(Alarm in Battery Back-up Mode Enable) and AFE
are set. Figure
15
illustrates the back-up mode
alarm timing.
Figure 14. Alarm Interrupt Reset Waveform
Figure 15. Back-up Mode Alarm Waveform
IRQ/FT/OUT/SQW
ACTIVE FLAG
0Fh
0Eh
10h
HIGH-Z
AI04617
V
CC
IRQ/FT/OUT/SQW
ABE and AFE Bits
AF Bit in Flags
Register
HIGH-Z
V
SO
V
PFD
trec
AI09164b
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