Feature Integration Technology Inc.
Fintek
F15353
If INT1# or INT2# pin output mode is set as the per-minute steady interrupt, INT1# or INT2# will pull low as the
first minute carry is performed. The data is set in register_2. A whole cycle of clock is 1 minute (50% duty) is
output from INT1# or INT2# pin.
Ex:
32kE=0, INT1AE=0 (INT1# pin output mode) INT2AE=0 (INT2# pin output mode)
Change by the program (OFF)
INT1ME, INTFE/
INT2ME, INT2FE
Minute Carrying Processing
Minute Carrying Processing
INT1# pin/INT2# pin
30s
30s
30s
30s
30s
30s
30s
30s
If the period is less than
123us, "L" signal is output
If the period is more
than123us, "H" signal is
output. "L" signal is output
Figure 6: Timing of Pre-minute Steady Interrupt Output1
6.5.5 Per-minute steady interrupt output2 (INT1# pin output mode only)
If INT1# or INT2# pin output mode is set as the per-minute steady interrupt, INT1# will pull low as the first
minute carry is performed. The output is the period of 7.9ms in synchronization with the minute carry processing
inside the IC. However, when real-time data is read, the minute carry processing is delayed by a maximum of
0.5 s and accordingly lowoutputfromthe INT1# pin is also delayed by 0.5s maximum. When the second data is
rewritten by a real-time data write command, counting starts from the rewritten second data and as a result, the
output interval during that period may become either longer or shorter.
V0.12P
16
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
