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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： | 17/19页 |
| 文件大小： | 193K |
| 代理商： | 12C887 |
DS12C887
7 of 19
CONTROL REGISTERS
The DS12C887 has four control registers which are accessible at all times, even during the update cycle.
REGISTER A
MSB
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
UIP
DV2
DV1
DV0
RS3
RS2
RS1
RS0
UIP - The Update In Progress (UIP) bit is a status flag that can be monitored. When the UIP bit is a 1, the
update transfer will soon occur. When UIP is a 0, the update transfer will not occur for at least 244
s.
The time, calendar, and alarm information in RAM is fully available for access when the UIP bit is 0. The
UIP bit is read-only and is not affected by RESET . Writing the SET bit in Register B to a 1 inhibits any
update transfer and clears the UIP status bit.
DV2, DV1, DV0 - These three bits are used to turn the oscillator on or off and to reset the countdown
chain. A pattern of 010 is the only combination of bits that will turn the oscillator on and allow the RTC
to keep time. A pattern of 11X will enable the oscillator but holds the countdown chain in reset. The next
update will occur at 500 ms after a pattern of 010 is written to DV0, DV1, and DV2.
RS3, RS2, RS1, RS0 - These four rate-selection bits select one of the 13 taps on the 15-stage divider or
disable the divider output. The tap selected can be used to generate an output square wave (SQW pin)
and/or a periodic interrupt. The user can do one of the following:
1. Enable the interrupt with the PIE bit;
2. Enable the SQW output pin with the SQWE bit;
3. Enable both at the same time and the same rate; or
4. Enable neither
Table 1 lists the periodic interrupt rates and the square wave frequencies that can be chosen with the RS
bits. These four read/write bits are not affected by RESET .
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