PT7C43390 Datasheet, PDF (20/38 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

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PT7C43390/43390C
Real-time Clock Module
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*1. Pin output is set to "H" by disabling the output mode within 7.81 ms, because the signal of this procedure is maintained for
7.81 ms. Note that pin output is set to "L" by setting enable the output mode again.
Timing of Per-Minute Edge Interrupt Output
d. Minute-periodical interrupt output 1
The minute-periodical interrupt 1 is the function to output the one-minute clock pulse (Duty 50%) from the INT1 / INT2 pin, when
the first minute-carry processing is done, after selecting the output mode.
*1. Setting the output mode disable makes the pin output "H", while the outputs from the INT1 / INT2 pin is in "L". Note that pin
output is set to "L" by setting enable the output mode again.
Timing of Per-Minute Steady Interrupt Output 1
e. Minute-periodical interrupt output 2 (only in the INT1 pin output mode)
The output of minute-periodical interrupt 2 is the function to output "L", for 7.81 ms, from the INT1 pin, synchronizing with the
first minute-carry processing after selecting the output mode. However, during reading in the real-time data register, the procedure
delays at 0.5 seconds max. Thus output "L" from the INT1 pin also delays at 0.5 seconds max. During writing in the real-time data
register, some delay is made in the output period due to write timing and the second-data during writing.
(1) During normal operation
2015-12-0001
PT0280-8 12/11/15
20