M16C1N Datasheet, PDF (73/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
10. Interrupt
10.2.2 INT0 Input Filter
The INT0 input has a digital filter which can be sampled by one of three sampling clocks. You select
the sampling clock using the INT0 Input Filter Select bits, bits 1 and 0.
INT0 interrupt request occurs when the sampled input level matches three times.
When selecting "Sampling with filter", the value of the port P45, if read, will be the value after filtering.
Figure 10.11 shows the INT0 input filter.
INT0
Port P45
direction
register
Figure 10.11 INT0 input filter
f1
f8
INT0 input filter ^f32
select bit
Digital filter
(input level
matches 3x)
INT0 input enable bit
INT0 interrupt request
Rev.1.00 Oct 20, 2004 page 61 of 222
REJ09B0007-0100Z