- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄359067 > M48TMH1 (意法半導(dǎo)體) 5V PC REAL TIME CLOCK PDF資料下載
參數(shù)資料
| 型號： | M48TMH1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 5V PC REAL TIME CLOCK |
| 中文描述： | 5V的電腦實(shí)時時鐘 |
| 文件頁數(shù)： | 11/23頁 |
| 文件大?。?/td> | 163K |
| 代理商： | M48TMH1 |
11/23
M48T86
Figure 10. Motorola Bus Read/Write Mode AC Waveforms
AI01649
tASD
tASW
AS
E
AD0-AD7
(Write)
tCYC
tDSH
tDAS
tCS
tRWH
tAS
tDHW
DS
R/W
tDSL
tRWS
tCH
AD0-AD7
(Read)
tDW
tAH
tAH
tAS
tOD
tDHR
PERIODIC INTERRUPT
The periodic interrupt will cause the IRQ pin to go
to an active state from once every 500ms to once
every 122μs. This function is separate from the
alarm interrupt which can be output from once per
second to once per day. The periodic interrupt rate
is selected using the same Register A bits which
select the square wave frequency (see Table 10).
Changing the Register A bits affects both the
square wave frequency and the periodic interrupt
output. However, each function has a separate en-
able bit in Register B. The periodic interrupt is en-
abled by the PIE bit (Register B; Bit 6). The
periodic interrupt can be used with software
counters to measure inputs, create output inter-
vals, or await the next needed software function.
ALARM INTERRUPT
The alarm interrupt provides the system processor
with an interrupt when a match is made between
the RTC's hours, minutes, and seconds bytes and
the corresponding alarm bytes.
The three alarm bytes can be used in two ways.
First, when the alarm time is written in the appro-
priate hours, minutes, and seconds alarm loca-
tions, the alarm interrupt is initiated at the specified
time each day if the Alarm Interrupt Enable bit
(Register B; Bit 5) is high. The second use is to in-
sert a "don't care" state in one or more of the three
alarm bytes. The "don't care" code is any hexadec-
imal value from C0 to FF. The two most significant
bits of each byte set the "don't care" condition
when at logic "1". An alarm will be generated each
hour when the "don't care" is are set in the hours
byte. Similarly, an alarm is generated every minute
with "don't care" codes in the hour and minute
alarm bytes. The "don't care" codes in all three
alarm bytes create an interrupt every second.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M48TMH1TR | 5V PC REAL TIME CLOCK |
| M48TY-85MH1 | 3.3V-5V TIMEKEEPER CONTROLLER |
| M48TY-85MH1TR | 3.3V-5V TIMEKEEPER CONTROLLER |
| M48TY-85PM1 | 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48Z02 | 16 Kbit 2Kb x 8 ZEROPOWER SRAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48TMH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V PC REAL TIME CLOCK |
| M48TPC1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V PC REAL TIME CLOCK |
| M48TPC1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V PC REAL TIME CLOCK |
| M4-8TP-RJ45 | 制造商:Hirschmann Electronics GmbH & Co Kg 功能描述:Media Module, MACH 4000, 8xRJ45 (10/100 Meg) + 8xRJ45 (10 Meg) Copper Ports |
| M48TV-70MH1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。