Posted on January 14, 2009 at 09:45Hi,
I am using the ST10F273 and I have an external peripheral (A2D) which needs to be serviced by the ST10F273. It signals it's readiness to be serviced via a falling edge signal on adigital IO connected to the ST10F273 P2.13 pin. I have configured P2.13 as an input and set up everything to cause the interrupt to happen. The problem is I get variable and very long latency (up to 80us) between the falling edge on P2.13 and the invocation of the ISR?? Here is the code I use to configure the fast external interrupt:
>>>>>>
// Fast external interrupt on falling edge
EXICON = 0x800;
// Capture on falling edge
CCM3 = 0x20;
// Set interrupt level and group
CC13IC = ADC_READ_GLVL | (ADC_READ_ILVL << 2) ;
// Enable interrupt
CC13IE = 1;
>>>>>>
Am I doing something wrong??
Thanks
Glenn
