Electronic Components Datasheet Search |
|
PCF8563P Datasheet(PDF) 5 Page - NXP Semiconductors |
|
PCF8563P Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 30 page Philips Semiconductors PCF8563 Real-time clock/calendar Product specification 16 April 1999 5 of 30 9397 750 04855 © Philips Electronics N.V. 1999. All rights reserved. 8.4 Reset The PCF8563 includes an internal reset circuit which is active whenever the oscillator is stopped. In the reset state the I2C-bus logic is initialized and all registers, including the address pointer, are cleared with the exception of bits FE, VL, TD1, TD0, TESTC and AE which are set to logic 1. 8.5 Voltage-low detector and clock monitor The PCF8563 has an on-chip voltage-low detector. When VDD drops below Vlow the VL bit (Voltage Low, bit 7 in the Seconds register) is set to indicate that reliable clock/calendar information is no longer guaranteed. The VL flag can only be cleared by software. The VL bit is intended to detect the situation when VDD is decreasing slowly for example under battery operation. Should VDD reach Vlow before power is re-asserted then the VL bit will be set. This will indicate that the time may be corrupted. 8.6 Register organization Fig 4. Voltage-low detection. handbook, halfpage VL set normal power operation period of battery operation t VDD Vlow MGR887 Table 4: Registers overview Bit positions labelled as ‘ −’are not implemented; those labelled with ‘0’ should always be written with logic 0. Address Register name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00H Control/Status 1 TEST1 0 STOP 0 TESTC 0 0 0 01H Control/Status 2 0 0 0 TI/TP AF TF AIE TIE 0DH CLKOUT frequency FE −−−−− FD1 FD0 0EH Timer control TE −−−−− TD1 TD0 0FH Timer countdown value <timer countdown value> |
Similar Part No. - PCF8563P |
|
Similar Description - PCF8563P |
|
|
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 |