Filter
Top Products
327
Chapter 25 External Interrupt
5.Operation
5. Operation
(1) External interrupt signal (INT) input
(2) Detect interrupt signals (level/edge).
(3) Valid edge signal (3xCLKP above required)
(4) An interrupt request generated.
(5) The interrupt request is cleared with software.
Remark: When waking up from STOP mode with edge detection enabled a minimum pulse pulse width (>
50ns) of the INT signal trigger must be fulfilled.
Level detection
INT (
“H”)
(“L”)
Valid edge
Interrupt request (ER)
Clear by software
(1)
(1)
(2)
(2)
(3)
(4)
(5)
Internal clock
(CLKP divided by two)
Valid edge
Interrupt requests (ER)
Clear by software
INT (rising)
(fallling)
Edge detection
(1)
(1)
(2)
(2)
(3)
(4)
(5)
Required to maintain the level more than
before and after the edge (3 x CLKP)