參數(shù)資料
型號(hào)： DS17487N-3
英文描述： 3V/5V Real-Time Clock
中文描述： 3V/5V實(shí)時(shí)時(shí)鐘
文件頁(yè)數(shù)： 11/38頁(yè)
文件大?。?/td> 427K
代理商： DS17487N-3
DS17485/DS17487
11 of 38
REGISTER C
MSB
BIT 7
IRQF
IRQF – Interrupt Request Flag.
This bit is set to a 1 when one or more of the following are true:
PF = PIE = 1
AF = AIE = 1
UF = UIE = 1
i.e., IRQF = (PF x PIE) + (AF x AIE) + (UF x UIE) + (WF x WIE) + (KF x KSE) + (RF x RIE)
Any time the IRQF bit is a 1, the
IRQ
pin is driven low. Flag bits PF, AF, and UF are cleared after
Register C is read by the program.
PF – Periodic Interrupt Flag.
This is a read-only bit that is set to a 1 when an edge is detected on the
selected tap of the divider chain. The RS3 through RS0 bits establish the periodic rate. PF is set to a 1
independent of the state of the PIE bit. When both PF and PIE are 1s, the
IRQ
signal is active and sets the
IRQF bit. The PF bit is cleared by a software read of Register C.
AF
–
Alarm Interrupt Flag.
A 1 in the AF bit indicates that the current time has matched the alarm
time. If the AIE bit is also a 1, the
IRQ
pin goes low and a 1 appears in the IRQF bit. A read of Register
C clears AF.
UF – Update Ended Interrupt Flag.
This bit is set after each update cycle. When the UIE bit is set to 1,
the 1 in UF causes the IRQF bit to be a 1, which asserts the
IRQ
pin. UF is cleared by reading Register C.
BIT 3 to BIT 0
– These are unused bits of the status Register C. These bits always read 0 and cannot be
written.
REGISTER D
MSB
BIT 7
BIT 6
BIT 5
BIT 4
VRT
0
0
0
VRT
–
Valid RAM and Time.
This bit is a read-only status bit. When VRT = 0, the RTC and RAM data
are questionable and indicates that the lithium energy source has been exhausted and should be replaced.
This bit indicates that status of the V
BAT
and V
BAUX
inputs.
BIT 6 to BIT 0
– The remaining bits of Register D are not usable. They cannot be written and, when
read, they always read 0.
LSB
BIT 0
0
BIT 6
PF
BIT 5
AF
BIT 4
UF
BIT 3
0
BIT 2
0
BIT 1
0
WF = WIE= 1
KF = KSE= 1
RF = RIE = 1
LSB
BIT 0
0
BIT 3
0
BIT 2
0
BIT 1
0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS17487N-5 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Real-Time Clock
DS17488 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Real-Time Clock
DS1750Y-150 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (Battery Based)
DS1750Y-150-IND 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (Battery Based)
DS1750Y-200 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (Battery Based)
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