參數(shù)資料
型號： FM3808
廠商： Electronic Theatre Controls, Inc.
元件分類： DRAM
英文描述： 4Kb FRAM Serial 3V Memory
中文描述： 4Kb的鐵電串行3V的記憶
文件頁數(shù)： 4/28頁
文件大小： 191K
代理商： FM3808
FM3808
Rev 1.1
May 2003
Page 4 of 28
Table 1. Register Map
Address
7FFFh
Description
Timekeeping – Years
D7
D6
D5
D4
D3
D2
D1
D0
10 year.3
Contains the lower two BCD digits of the year. Lower nibble contains the value for years; upper nibble
contains the value for 10s of years. Each nibble operates from 0 to 9. The range for the register is 0-99.
Timekeeping – Months
D7
D6
D5
D4
10 year.2
10 year.1
10 year.0
Year.3
Year.2
Year.1
Year.0
7FFEh
D3
D2
D1
D0
0
0
0
10 Month
Month.3
Month.2
Month.1
Month.0
Contains the BCD digits for the month. Lower nibble contains the lower digit and operates from 0 to 9;
upper nibble (one bit) contains the upper digit and operates from 0 to 1. The range for the register is 1-
12.
Timekeeping – Date of the month
D7
D6
D5
D4
7FFDh
D3
D2
D1
D0
0
0
10 date.1
10 date.0
Date.3
Date.2
Date.1
Date.0
Contains the BCD digits for the date of the month. Lower nibble contains the lower digit and operates
from 0 to 9; upper nibble contains the upper digit and operates from 0 to 3. The range for the register is
1-31.
Timekeeping – Day of the week
D7
D6
D5
D4
7FFCh
D3
D2
D1
D0
0
0
0
0
0
Day.2
Day.1
Day.0
Lower nibble contains a value that correlates to day of the week. Day of the week is a ring counter that
counts from 1 to 7 then returns to 1. The user must assign meaning to the day value, as the day is not
integrated with the date.
Timekeeping – Hours
D7
D6
D5
D4
7FFBh
D3
D2
D1
D0
0
0
10 hours.1
10 hours.0
Hours.3
Hours2
Hours.1
Hours.0
Contains the BCD value of hours in 24-hour format. Lower nibble contains the lower digit and operates
from 0 to 9; upper nibble (two bits) contains the upper digit and operates from 0 to 2. The range for the
register is 0-23.
Timekeeping – Minutes
D7
D6
D5
D4
7FFAh
D3
D2
D1
D0
0
10 min.2
10 min.1
10 min.0
Min.3
Min.2
Min.1
Min.0
Contains the BCD value of minutes. Lower nibble contains the lower digit and operates from 0 to 9;
upper nibble contains the upper minutes digit and operates from 0 to 5. The range for the register is 0-59.
Timekeeping – Seconds
D7
D6
D5
D4
7FF9h
D3
D2
D1
D0
0
10 sec.2
10 sec.1
10 sec.0
Seconds.3
Seconds.2
Seconds.1
Seconds.0
Contains the BCD value of seconds. Lower nibble contains the lower digit and operates from 0 to 9;
upper nibble contains the upper digit and operates from 0 to 5. The range for the register is 0-59.
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FM3808_06 制造商:RAMTRON 制造商全稱:RAMTRON 功能描述:256Kb Bytewide FRAM w/ Real-Time Clock
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