Electronic Components Datasheet Search |
|
RV5C348A Datasheet(PDF) 11 Page - RICOH electronics devices division |
|
RV5C348A Datasheet(HTML) 11 Page - RICOH electronics devices division |
11 / 53 page R ×5C348A/B 8 5. Oscillation Halt Sensing Function and Supply Voltage Monitoring Function The R ×5C348A/B incorporate an oscillation halt sensing circuit equipped with internal registers configured to record any past oscillation halt, thereby identifying whether they are powered on from 0 volts or battery backed-up. As such, the oscillation halt sensing circuit is useful for judging the validity of time data. The R ×5C348A/B also incorporate a supply voltage monitoring circuit equipped with internal registers configured to record any drop in supply voltage below a certain threshold value. Supply voltage monitoring threshold settings can be selected between 2.1 and 1.6 volts through internal register settings. The oscillation halt sensing circuit is configured to confirm the established invalidation of time data in contrast to the supply voltage monitoring circuit intended to confirm the potential invalidation of time data. Further, the supply voltage monitoring circuit can be applied to battery supply voltage monitoring. 6. Periodic Interrupt Function The R ×5C348A/B incorporate a periodic interrupt circuit configured to generate periodic interrupt signals aside from interrupt signals generated by the alarm circuit for output from the INTR pin. Periodic interrupt signals have five selectable frequency settings of 2Hz (once per 0.5 seconds), 1Hz (once per 1 second), 1/60Hz (once per 1 minute), 1/3600Hz (once per 1 hour), and monthly (the first day of every month). Further, periodic interrupt signals also have two selectable waveforms of a normal pulse form (with a frequency of 2Hz or 1Hz) and special form adapted to interruption from the CPU in the level mode (with second, minute, hour, and month interrupts). The register records of periodic interrupt signals can be monitored by using a polling function. 7. 32-kHz Clock Output Function The R ×5C348A/B incorporate a 32-kHz clock circuit configured to generate clock pulses with the oscillation frequency of a 32.768-kHz crystal oscillator for output from the 32KOUT pin (Nch. open drain output). For the R ×5C348A, the 32-kHz clock output can be disabled by certain register settings. But it cannot be disabled without manipulation of any two registers with different addresses, to prevent disabling in such events as the runaway of the CPU. For the R ×5C348B, however, the 32-kHz clock circuit cannot be disabled by any register settings. For both the R ×5C348A and the R×5C348B alike, the 32-kHz clock circuit is enabled at power-on. |
Similar Part No. - RV5C348A |
|
Similar Description - RV5C348A |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |