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參數(shù)資料
| 型號： | MM58167MWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, UUC24 |
| 封裝： | WAFER-24 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 195K |
| 代理商： | MM58167MWC |
Functional Description (Continued)
TABLE II Clock RAM Bit Map for Alarm Interrupt Everyday at 1015 am
Address
Data
Function
Hi Nibble
Lo Nibble
4321076
5
4
32
1
0
Milliseconds
0
1
0
No RAM Exists
Hundredths and
0100100
0
00
0
Tenths of Seconds
Seconds
0
1
0
1
0
Minutes
0
1
0
1
0
1
0
1
0
1
Hours
0
1
0
1
0
Day of Week
0
1
0
1
No RAM Exists
1
X
Day of Month
0
1
0
1
X
1
X
Months
0
1
X
1
X
TABLE III Address Codes and Function
A4
A3
A2
A1
A0
Function
0
CounterMilliseconds
0
1
CounterHundredths and Tenths of Seconds
0
1
0
CounterSeconds
0
1
CounterMinutes
0
1
0
CounterHours
0
1
0
1
CounterDay of Week
0
1
0
CounterDay of Month
0
1
CounterMonth
0
1
0
RAMMilliseconds
0
1
0
1
RAMHundredths and Tenths of Seconds
0
1
0
1
0
RAMSeconds
0
1
0
1
RAMMinutes
0
1
0
RAMHours
0
1
0
1
RAMDay of Week
0
1
0
RAMDay of Month
0
1
RAMMonths
1
0
Interrupt Status Register
1
0
1
Interrupt Control Register
1
0
1
0
Counters Reset
1
0
1
RAM Reset
1
0
1
0
Status Bit
1
0
1
0
1
GO Comand
1
0
1
0
STANDBY INTERRUPT
1
Test Mode
All others unused
The comparator is a cascaded exclusive NOR Its output is
latched 61 ms after the rising edge of the 1 kHz clock signal
(input to the milliseconds counter) This allows the counter
to ripple through before looking at the comparator For oper-
ation at less than 45V the thousandths of seconds counter
should not be included in a compare because of the possi-
bility of having a ripple delay greater than 61 ms (For output
timing see Interrupt Timing)
Power Down Mode
The POWER DOWN input is essentially a second chip se-
lect
It disables all inputs and outputs except for the
STANDBY INTERRUPT When this input is at a logical zero
the device will not respond to any external signals It will
however maintain timekeeping and turn on the STANDBY
INTERRUPT if programmed to do so (The programming
must be done before the POWER DOWN input goes to a
4
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