參數(shù)資料
型號： RS5C372A
廠商： RICOH COMPANY LTD
元件分類： XO, clock
英文描述： I2C bus SERIAL INTERFACE REAL-TIME CLOCK ICs
中文描述： 0 TIMER(S), REAL TIME CLOCK, PDSO8
封裝： SSOP-8
文件頁數(shù)： 44/59頁
文件大?。?/td> 442K
代理商： RS5C372A
RS5C372A/B
40
3. Oscillator Halt Sensing
Oscillation halt can be sensed through monitoring the XSTP bit with preceding setting of the XSTP bit to 0 by writ-
ing data to the control register 2. Upon oscillator halt sensing, the XSTP bit is switched from 0 to 1. This function
can be applied to judge clock data validity. When the XSTP bit is 1, XSL, F
6
to F
0
, CT
2
, CT
1
, CT
0
, AALE, BALE, SL
2
,
SL
1
, CLEN and TEST bits are reset to 0.
Considerations in Use of XSTP Bit
Ensure error-free oscillation halt sensing by preventing the following events:
1) Instantaneous disconnection of V
DD
2) Condensation on the crystal oscillator
3) Generation of noise on the PCB in the crystal oscillator
4) Application of voltage exceeding prescribed maximum ratings to the individual pins of the IC.
*
1) The XSTP bit is set to 1 upon power-on from 0V.
Note that any instantaneous power disconnection may cause operation failure.
*
2) Once oscillation halt has been sensed, the XSTP bit is held at 1 even if oscillation is restarted.
4. INTRA Output and INTRB Output Pins
(RS5C372A)
, INTR Output Pin
(RS5C372B)
4.1 INTRA Output and INTRB Output Pins
(RS5C372A)
The following three output wave forms can be output from the INTRA or the INTRB pin.
1) Alarm interrupt
When a registered time for alarm (such as day-of-the-week, hour or minute) coincide with calendar counter (such
as day-of-the-week, hour or minute) interrupt to the CPU are requested with the output pin being on (“L”). Alarm
interrupt consists of Alarm_A and Alarm_B, both have equivalent functions.
2) Periodic interrupt
Outputs an output wave form selected by setting the periodic interrupt frequency select bit. Wave forms include
pulse mode and level mode.
3) 32-kHz clock output
Clock pulses generated in the oscillation circuit are output as they are.
4.1-1 Control of the INTRA, INTRB Output (flag bit, enable bit, interrupt output select bit) (RS5C372A)
Of the three output wave forms listed above, interrupt output conditions may be set by setting the flag bit that moni-
tors output state on the register, the enable bit that enables an output wave form and the output select bit that
selects either INTRA or INTRB to be output a wave form to.
Interrupt output select bit (SL2, SL1)
(D5, D4 at Eh)
Flag bit
Enable bit
(0,0)
(0,1)
(1,0)
(1,1)
Alarm_A
AAFG (D1 at Fh)
AALE (D7 at Eh)
INTRA
INTRA
INTRA
INTRA
Alarm_B
BAFG (D0 at Fh)
BALE (D6 at Eh)
INTRA
INTRB
INTRA
INTRB
Periodic interrupt
CTFG (D2 at Fh)
Disabled at CT
2
=CT
1
=CT
0
=0
(D2 to D0 at Eh)
INTRA
INTRA
INTRB
INTRB
32-kHz clock output
No
CLEN (D3 at Fh)
INTRB
INTRB
INTRB
INTRB
相關(guān)PDF資料
PDF描述
RS5C372B I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C372B-E1 I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C372B-E2 I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C62 REAL-TIME CLOCK
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RS5C372B 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C372B-E1 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C372B-E2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C373A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock
RS5C4FC 制造商:Dialight 功能描述:
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