參數(shù)資料
型號(hào)： X1226
英文描述： Real Time Clock/Calendar with EEPROM
中文描述： 實(shí)時(shí)時(shí)鐘/日歷帶有EEPROM
文件頁(yè)數(shù)： 5/24頁(yè)
文件大?。?/td> 420K
代理商： X1226
X1226
REV 1.1.24 1/13/03
Characteristics subject to change without notice.
5 of 24
www.xicor.com
ALARM REGISTERS
There are two alarm registers whose contents mimic the
contents of the RTC register, but add enable bits and
exclude the 24 hour time selection bit. The enable bits
specify which registers to use in the comparison between
the Alarm and Real Time Registers. For example:
– Setting the Enable Month bit (EMOn*) bit in combi-
nation with other enable bits and a specific alarm
time, the user can establish an alarm that triggers at
the same time once a year.
*n = 0 for Alarm 0: N = 1 for Alarm 1
When there is a match, an alarm flag is set. The occur-
rence of an alarm can be determined by polling the
AL0 and AL1 bits or by enabling the IRQ output, using
it as hardware flag.
The alarm enable bits are located in the MSB of the
particular register. When all enable bits are set to ‘0’,
there are no alarms.
– The user can set the X1226 to alarm every Wednes-
day at 8:00 AM by setting the EDWn*, the EHRn*
and EMNn* enable bits to ‘1’ and setting the DWAn*,
HRAn* and MNAn* Alarm registers to 8:00 AM
Wednesday.
– A daily alarm for 9:30PM results when the EHRn*
and EMNn* enable bits are set to ‘1’ and the HRAn*
and MNAn* registers are set to 9:30 PM.
*n = 0 for Alarm 0: N = 1 for Alarm 1
REAL TIME CLOCK REGISTERS
Clock/Calendar Registers (SC, MN, HR, DT, MO, YR)
These registers depict BCD representations of the
time. As such, SC (Seconds) and MN (Minutes) range
from 00 to 59, HR (Hour) is 1 to 12 with an AM or PM
indicator (H21 bit) or 0 to 23 (with MIL=1), DT (Date) is
1 to 31, MO (Month) is 1 to 12, YR (Year) is 0 to 99.
Date of the Week Register (DW)
This register provides a Day of the Week status and
uses three bits DY2 to DY0 to represent the seven
days of the week. The counter advances in the cycle
0-1-2-3-4-5-6-0-1-2-… The assignment of a numerical
value to a specific day of the week is arbitrary and may
be decided by the system software designer. The
default value is defined as ‘0’.
24 Hour Time
If the MIL bit of the HR register is 1, the RTC uses a
24-hour format. If the MIL bit is 0, the RTC uses a 12-
hour format and H21 bit functions as an AM/PM
indicator with a ‘1’ representing PM. The clock defaults
to standard time with H21=0.
Leap Years
Leap years add the day February 29 and are defined
as those years that are divisible by 4. Years divisible by
100 are not leap years, unless they are also divisible
by 400. This means that the year 2000 is a leap year,
the year 2100 is not. The X1226 does not correct for
the leap year in the year 2100.
STATUS REGISTER (SR)
The Status Register is located in the CCR memory
map at address 003Fh. This is a volatile register only
and is used to control the WEL and RWEL write
enable latches, read power status and two alarm bits.
This register is separate from both the array and the
Clock/Control Registers (CCR).
Table 2. Status Register (SR)
BAT: Battery Supply—Volatile
This bit set to “1” indicates that the device is operating
from V
BACK
, not V
CC
. It is a read-only bit and is set/
reset by hardware (X1226 internally). Once the device
begins operating from V
CC
“0”.
, the device sets this bit to
AL1, AL0: Alarm bits—Volatile
These bits announce if either alarm 0 or alarm 1 match
the real time clock. If there is a match, the respective
bit is set to ‘1’. The falling edge of the last data bit in a
SR Read operation resets the flags. Note: Only the AL
bits that are set when an SR read starts will be reset.
An alarm bit that is set by an alarm occurring during an
SR read operation will remain set after the read opera-
tion is complete.
RWEL: Register Write Enable Latch—Volatile
This bit is a volatile latch that powers up in the LOW
(disabled) state. The RWEL bit must be set to “1” prior
to any writes to the Clock/Control Registers. Writes to
RWEL bit do not cause a nonvolatile write cycle, so the
device is ready for the next operation immediately after
the stop condition. A write to the CCR requires both
the RWEL and WEL bits to be set in a specific
sequence.
Addr
7
6
5
4
3
2
1
0
003Fh
Default
BAT
0
AL1
0
AL0
0
0
0
0
0
RWEL
0
WEL
0
RTCF
1
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
X1226_06 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Real Time Clock/Calendar with EEPROM
X122621-AT 功能描述:基本/快動(dòng)開關(guān) SEALED OI-SE SWITCH RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:SPDT 執(zhí)行器:Lever 電流額定值:5 A 電壓額定值 AC:250 V 電壓額定值 DC:30 V 功率額定值: 工作力:120 g IP 等級(jí):IP 67 NEMA 額定值: 端接類型:Wire 安裝:Panel
X122623-AT 功能描述:基本/快動(dòng)開關(guān) SEALED OI-SE SWITCH RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:SPDT 執(zhí)行器:Lever 電流額定值:5 A 電壓額定值 AC:250 V 電壓額定值 DC:30 V 功率額定值: 工作力:120 g IP 等級(jí):IP 67 NEMA 額定值: 端接類型:Wire 安裝:Panel
X122624-AT 功能描述:基本/快動(dòng)開關(guān) SEALED OI-SE SWITCH RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:SPDT 執(zhí)行器:Lever 電流額定值:5 A 電壓額定值 AC:250 V 電壓額定值 DC:30 V 功率額定值: 工作力:120 g IP 等級(jí):IP 67 NEMA 額定值: 端接類型:Wire 安裝:Panel
X122625-AT 功能描述:基本/快動(dòng)開關(guān) SEALED OI-SE SWITCH RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:SPDT 執(zhí)行器:Lever 電流額定值:5 A 電壓額定值 AC:250 V 電壓額定值 DC:30 V 功率額定值: 工作力:120 g IP 等級(jí):IP 67 NEMA 額定值: 端接類型:Wire 安裝:Panel
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