參數(shù)資料
型號(hào)： R2033T
廠商： Ricoh Co., Ltd.
英文描述： 3 wire interface Real-Time Clock ICs
中文描述： 3線接口實(shí)時(shí)時(shí)鐘芯片
文件頁(yè)數(shù)： 39/50頁(yè)
文件大?。?/td> 542K
代理商： R2033T
R2033K/T
39
Alarm Interrupt
The alarm interrupt circuit is controlled by the enable bits (i.e. the WALE and DALE bits in the Control Register 1)
and the flag bits (i.e. the WAFG and DAFG bits in the Control Register 2). The enable bits can be used to
enable this circuit when set to 1 and to disable it when set to 0. When intended for reading, the flag bits can be
used to monitor alarm interrupt signals. When intended for writing, the flag bits will cause no event when set to
1 and will drive high (disable) the alarm interrupt circuit when set to 0.
The enable bits will not be affected even when the flag bits are set to 0. In this event, therefore, the alarm
interrupt circuit will continue to function until it is driven low (enabled) upon the next occurrence of a match
between current time and preset alarm time.
The alarm function can be set by presetting desired alarm time in the alarm registers (the Alarm_W Registers for
the day-of-week digit settings and both the Alarm_W Registers and the Alarm_D Registers for the hour and
minute digit settings) with the WALE and DALE bits once set to 0 and then to 1 in the Control Register 1. Note
that the WALE and DALE bits should be once set to 0 in order to disable the alarm interrupt circuit upon the
coincidental occurrence of a match between current time and preset alarm time in the process of setting the
alarm function.
between current time and preset alarm time
occurs
current time =
preset alarm time
WALE
←
1
(DALE)
Interval (1min.) during which a match
current time =
preset alarm time
WAFG
←
0
(DAFG)
INTR
WALE
←
1
(DALE)
WALE
←
1
(DALE)
current time =
preset alarm time
WALE
←
0
(DALE)
current time =
preset alarm time
INTR
After setting WALE(DALE) to 0, Alarm registers is set to current time, and WALE(DALE) is set to 1, INTR will
be not driven to “L” immediately, INTR will be driven to “L” at next alarm setting time.
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參數(shù)描述
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