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| 型號(hào)： | P95020ZLLG |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA124 |
| 封裝： | LLGA-124 |
| 文件頁(yè)數(shù)： | 101/137頁(yè) |
| 文件大?。?/td> | 3533K |
| 代理商： | P95020ZLLG |
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P95020 / Preliminary Datasheet
Revision 0.7.10
66
2010 Integrated Device Technology, Inc.
5.0 RTC MODULE
FEATURES
Real Time Clock (RTC) Counts Seconds, Minutes,
Hours, Day, Date, Month and Year (with Leap-Year
Compensation Valid Up to year 2100
Two time-of-day alarms
Low power
DESCRIPTION
The low power serial real-time clock (RTC) device has two
programmable time-of-day alarms. Address and data are
transferred serially through the IC bus. The device
provides seconds, minutes, hours, day, date, month and
year information. The date at the end of the month is
automatically adjusted for months with fewer than 31
days, including corrections for leap year. The clock
operates in either 24-hour format or 12-hour format with
AM/PM indicator.
5.1
RTC - GENERAL DESCRIPTION
The Real-Time Clock (RTC) block is a low-power clock/date device with two programmable time-of-day/date alarms. The
clock/date provides seconds, minutes, hours, day, date, month and year information. The date at the end of the month is
automatically adjusted for months with fewer than 31 days, including corrections for leap years. The clock operates in
either the 24-hour or 12-hour format with an AM/PM indicator. The RTC cannot be disabled while the system is powered
on. The register settings and logic are only reset the first time the system is powered on by inserting either the wall
adapter or the battery. After reset, the time keeping registers are reset and must be synchronized to the real time by
programming its time keeping registers. The alarm interrupts are disabled by default.
The time and date information is set and monitored by writing and reading the appropriate register bytes. Sections 5.2
and 5.3 below show the RTC TIMEKEEPER and RTC DATE registers. The contents of the time and date registers are in
BCD format. The RTC block can be run in either 12-hour or 24-hour mode. Bit 6 of the HOUR register is defined as the
12-hour or 24-hour mode-select bit. When high, the 12-hour mode is selected. In 12-hour mode, bit 5 is the PM bit with
logic high being PM. In the 24-hour mode, bit 5 is the second 10-hour bit (20 to 23 hours). All hour values, including the
alarms, must be re-entered whenever the TIME_12 mode bit is changed. The century bit (bit 7 of the month register) is
toggled when the YEAR register overflows from 99 to 0. The days register increments at midnight. Values that
correspond to the day of week are user-defined, but must be sequential (i.e., if 1 equals Sunday, then 2 equals Monday
and so on). Illogical time and date entries result in undefined operation.
When reading or writing the time and date registers, secondary (user) buffers are used to prevent errors when the internal
registers update. When reading the time and date registers, the user buffers are synchronized to the internal registers at
the time of reading address pointing to zero. The countdown chain is reset whenever the seconds register is written.
Write transfer occurs when the processor bus receives a write command. To avoid rollover issues, once the countdown
chain is reset, the remaining time and date registers must be written within 0.5 second.
The RTC block contains two time-of-day/date alarms. The alarms can be programmed (via the alarm enable and INT_EN
bits of the control registers defined in section 5.5) to activate the interrupt (INT) output when an alarm match condition
occurs. Bit 7 of each of the time of day/date alarm registers are mask bits (Table 2). When all the mask bits for each
alarm are logic 0 an alarm occurs only when the values in the timekeeping registers 00h to 04h match the values stored in
the time-of-day/date alarm register. The alarms can also be programmed to repeat every second, minute, hour, day or
date. Table 16 shows the possible settings.
Table 16 - Alarm mask bits
DY1
A1M4
A1M3
A1M2
A1M1
Alarm rate
X
1
Alarm once per second
X
1
0
Alarm when seconds match
X
1
0
Alarm when minutes and seconds match
X
1
0
Alarm when hours, minutes, and seconds match
0
Alarm when date, hours, minutes, and seconds match
1
0
Alarm when day, hours, minutes, and seconds match
DY2
A2M4
A2M3
A2M2
A2M1
Alarm rate
X
1
Alarm once per second
X
1
0
Alarm when seconds match
X
1
0
Alarm when minutes and seconds match
X
1
0
Alarm when hours, minutes, and seconds match
0
Alarm when date, hours, minutes, and seconds match
1
0
Alarm when day, hours, minutes, and seconds match
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