PT7C43190 Datasheet, PDF (15/32 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

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Timing of Low Power Supply Voltage Detection Circuit
7. Circuits Power-on and Low Power Supply Voltage Detection
Below Figure shows the changes of the POC flag and BLD flag due to VDD fluctuation.
POC Flag and BLD Flag
8. Nonexistent Data and End-of-Month
When users write the real-time data, the RTC checks it. In case that the data is invalid, the RTC does the following procedures.
 Processing of nonexistent data
*1. In 12-hour mode, write the AM / PM flag (B1 in hour data in the real-time data register). In 24-hour expression, the AM / PM
flag in the real-time data register is omitted. However in the flag of reading, users are able to read 0; 0 to 11, 1; 12 to 23.
*2. Processing of nonexistent data, regarding second data, is done by a carry pulse which is generated in 1 second, after writing. At
this point the carry pulse is sent to the minute-counter.
 Correction of end-of-month
A nonexistent day, such as February 30 and April 31, is set to the first day of the next month.
2015-09-0015
15
PT0274-7 10/16/15