beautypg.com

Operation – FUJITSU MB91460 SERIES FR60 User Manual

Page 343

background image

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)