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FM3316 参数 Datasheet PDF下载

FM3316图片预览
型号: FM3316
PDF下载: 下载PDF文件 查看货源
内容描述: 3V集成处理器伴侣与记忆 [3V Integrated Processor Companion with Memory]
分类和应用:
文件页数/大小: 28 页 / 317 K
品牌: RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
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FM33256/FM3316 SPI Companion w/ FRAM  
Table 3. Alarm Match Bit Examples  
Seconds Minutes Hours Date Months Alarm condition  
1
0
0
0
0
1
1
0
0
0
1
1
1
0
0
1
1
1
1
0
1
1
1
1
1
No match required = alarm 1/second  
Alarm when seconds match = alarm 1/minute  
Alarm when seconds, minutes match = alarm 1/hour  
Alarm when seconds, minutes, hours match = alarm 1/date  
Alarm when seconds, minutes, hours, date match = alarm 1/month  
read by the user. If a timekeeper update is pending  
when R is set, then the core will be updated prior to  
loading the user registers. The user registers are  
frozen and will not be updated again until the R bit is  
cleared to a ‘0’.  
Real-time Clock Operation  
The real-time clock (RTC) is a timekeeping device  
that can be capacitor- or battery-backed for  
permanently-powered operation. It offers a software  
calibration feature that allows high accuracy.  
The W bit is used to write new time/date values.  
Setting the W bit to a ‘1’ stops the RTC and allows  
the timekeeping core to be written with new data.  
Clearing it to ‘0’ causes the RTC to start running  
based on the new values loaded in the timekeeper  
core. The RTC may be synchronized to another clock  
source. On the 8th clock of the write to register 00h  
(W=0), the RTC starts counting with a timebase that  
has been reset to zero milliseconds.  
The RTC consists of an oscillator, clock divider, and  
a register system for user access. It divides down the  
32.768 kHz time-base and provides a minimum  
resolution of seconds (1Hz). Static registers provide  
the user with read/write access to the time values. It  
includes registers for seconds, minutes, hours, day-  
of-the-week, date, months, and years. A block  
diagram shown in Figure 9 illustrates the RTC  
function.  
Note: Users should be certain not to load invalid  
values, such as FFh, to the timekeeping registers.  
Updates to the timekeeping core occur continuously  
except when locked.  
The user registers are synchronized with the  
timekeeper core using R and W bits in register 00h.  
The R bit is used to read the time. Changing the R bit  
from 0 to 1 transfers timekeeping information from  
the core into the user registers 02-08h that can be  
512 Hz or  
SW out  
/OSCEN  
Oscillator  
W
Clock  
Divider  
Update  
Logic  
32.768 kHz  
crystal  
1 Hz  
Years  
8 bits  
Months  
5 bits  
Date  
6 bits  
Hours  
6 bits  
Minutes  
7 bits  
Seconds  
7 bits  
CF  
Days  
3 bits  
R
User Registers  
Figure 9. Real-time Clock Core Block Diagram  
Rev. 1.0  
Dec. 2006  
Page 8 of 28