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參數(shù)資料
| 型號： | M48T254V-10ZA1 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | REAL TIME CLOCK, PBGA168 |
| 封裝： | 42.50 X 42.50 MM, 1.27 MM PITCH, BGA-168 |
| 文件頁數(shù)： | 6/26頁 |
| 文件大?。?/td> | 366K |
| 代理商： | M48T254V-10ZA1 |
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M48T254V
14/26
Clock Register Information
Clock information is contained in eight registers of
8 bits, each of which is sequentially accessed one
(1) bit at a time after the 64-bit pattern recognition
sequence has been completed. When updating
the clock registers, each must be handled in
groups of 8 bits. Writing and reading individual bits
within a register could produce erroneous results.
These READ/WRITE registers are defined in the
clock register map (see Table 4.).
Data contained in the clock registers is in Binary
Coded Decimal format (BCD). Reading and writing
the registers is always accomplished by stepping
through all eight registers, starting with Bit 0 of
Register 0 and ending with Bit 7 of Register 7.
AM-PM/12/24 Mode
Bit 7 of the hours register is defined as the 12-hour
or 24-hour mode select bit. When it is high, the 12-
hour mode is selected. In the 12-hour mode, Bit 5
is the AM/PM bit with the logic high being “PM.” In
the 24-hour mode, Bit 5 is the second 10-hour bit
(20-23 hours).
Oscillator Bit
Bit 5 controls the oscillator. When set to logic '0,'
the oscillator turns on and the RTC/calendar be-
gins to increment.
Zero Bits
Registers 1, 2, 3, 4, 5, and 6 contain one (1) or
more bits that will always read logic '0.' When writ-
ing to these locations, either a logic '1' or '0' is ac-
ceptable.
Table 4. RTC Register Map
Keys:
A/P = AM/PM Bit
12/24 = 12 or 24-hour mode Bit
OSC = Oscillator Bit
RST = Reset Bit
0 = Must be set to '0'
1 = Must be set to '1'
Function/Range
BCD Format
Register
D7
D6
D5
D4
D3
D2
D1
D0
0
0.1 Seconds
0.01 Seconds
Seconds
00-99
1
0
10 Seconds
Seconds
00-59
2
0
10 Minutes
Minutes
00-59
3
12/24
0
10/
A/P
Hrs
Hours (24 Hour Format)
Hours
01-12/
00-23
40
0
OSC
1
0
Day of the Week
Day
01-7
5
0
10 date
Date: Day of the Month
Date
01-31
6
0
10M
Month
01-12
7
10 Years
Year
00-99
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