MC81F4104 Datasheet, PDF (65/118 Pages) Finechips – ABOV SEMICONDUCTOR

MC81F4104
12.2 Procedure
To generate external interrupt, following steps are required,
1. Prepare external interrupt sub-routine(function).
2. Set external interrupt pins to input mode. (use RnCONH/M/L registers).
3. Enable the external interrupt and select the edge mode. (use EINT0 register).
4. Make sure global interrupt is enabled. (use „EI‟ instruction).
After finish above steps, the external interrupt sub-routine is calling, when the edge is detected.
When the generated external interrupt is one of the external interrupt groups, the EINTF register is
used to recognize which external interrupt is generated.
October 19, 2009 Ver.1.35
65