參數(shù)資料
型號(hào): M41T00CAPPC1
廠商: STMICROELECTRONICS
元件分類: 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述: REAL TIME CLOCK, PDIP24
封裝: ROHS COMPLIANT, PLASTIC, DIP-24
文件頁數(shù): 6/27頁
文件大小: 224K
代理商: M41T00CAPPC1
Clock operation
M41T00CAP
4
Clock operation
The 8-byte register map (see Table 2) is used to both set the clock and to read the date and
time from the clock, in a binary coded decimal format. Seconds, minutes, and hours are
contained within the first three registers. Bits D6 and D7 of clock register 02h (century/hours
register) contain the century enable bit (CEB) and the century bit (CB). Setting CEB to a '1'
will cause CB to toggle, either from '0' to '1' or from '1' to '0' at the turn of the century
(depending upon its initial state). If CEB is set to a '0,' CB will not toggle. Bits D0 through D2
of Register 03h contain the Day (day of week). Registers 04h, 05h, and 06h contain the date
(day of month), month and years. The eighth clock register is the calibration register (this is
described in the clock calibration section). Bit D7 of register 00h contains the STOP bit (ST).
Setting this bit to a '1' will cause the oscillator to stop. If the device is expected to spend a
significant amount of time on the shelf, the oscillator may be stopped to reduce current
drain. When reset to a '0' the oscillator restarts within one second. The seven clock registers
may be read one byte at a time, or in a sequential block. The calibration register (address
location 07h) may be accessed independently. Provision has been made to ensure that a
clock update does not occur while any of the seven clock addresses are being read. If a
clock address is being read, an update of the clock registers will be halted. This will prevent
a transition of data during the READ.
Keys:
0 = must be set to '0'
CB = century bit
CEB = century enable bit
FT = frequency test bit
OF = oscillator fail bit
OUT = output level
S = sign bit
ST = stop bit
Table 2. TIMEKEEPER register map
Add
Function/range BCD format
D7
D6
D5
D4
D3
D2
D1
D0
00h
ST
10 seconds
Seconds
00-59
01h
OF
10 minutes
Minutes
00-59
02h
CEB
CB
10 hours
Hours (24-hour format)
Century/hours
0-1/00-23
03h
0000
0
Day of week
Day
01-7
04h
0
10 date
Date: day of month
Date
01-31
05h
0
10M
Month
01-12
06h
10 years
Year
00-99
07h
OUT
FT
S
Calibration
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