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参数资料
| 型号： | 12C887 |
| 英文描述： | Test Prod Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:Black; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1 RoHS Compliant: Yes |
| 中文描述： | 实时时钟 |
| 文件页数： | 19/19页 |
| 文件大小： | 193K |
| 代理商： | 12C887 |
DS12C887
9 of 19
REGISTER C
MSB
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
IRQF
PF
AF
UF
0
IRQF - The Interrupt Request Flag (IRQF) 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 ● PIE) + (AF ● AIE) + (UF ● UIE)
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 or when the RESET pin is low.
PF - The Periodic Interrupt Flag (PF) is a read-only bit which 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 1’s, the IRQ signal is active and will
set the IRQF bit. The PF bit is cleared by a software read of Register C or a RESET .
AF - A 1 in the Alarm Interrupt Flag (AF) bit indicates that the current time has matched the alarm time.
If the AIE bit is also a 1, the IRQ pin will go low and a 1 will appear in the IRQF bit. A RESET or a read
of Register C will clear AF.
UF - The Update Ended Interrupt Flag (UF) 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 will assert the IRQ pin. UF is cleared by reading
Register C or a RESET .
BIT 3 THROUGH BIT 0 - These are unused bits of the status Register C. These bits always read 0 and
cannot be written.
REGISTER D
MSB
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
VRT
0
0000
00
VRT - The Valid RAM and Time (VRT) bit indicates the condition of the battery connected to the VBAT
pin. This bit is not writeable and should always be a 1 when read. If a 0 is ever present, an exhausted
internal lithium energy source is indicated and both the contents of the RTC data and RAM data are
questionable. This bit is unaffected by RESET .
BIT 6 THROUGH BIT 0 - The remaining bits of Register D are not usable. They cannot be written and,
when read, they will always read 0.
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