C167CS datasheet(112/517 Pages) INFINEON

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C167CS

Derivatives

Interrupt and Trap Functions

User’s Manual

5-29

V2.0, 2000-07

External Interrupt Source Control

The input source for fast external interrupts (controlled via register EXICON) can be

derived either from the associated port pin EXnIN or from an alternate source. This

selection is controlled via register EXISEL.

Activating the alternate input source e.g. permits the detection of transitions on the

interface lines of disabled interfaces. Upon this trigger the respective interface can be

reactivated and respond to the detected activity.

Table 5-9 summarizes the association of the bitfields of register EXISEL with the

respective interface input lines.

EXISEL

Ext. Interrupt Source Reg.

ESFR (F1DAH/EDH)

Reset Value: 0000H

98765

43210

EXI7SS

EXI6SS

EXI5SS

EXI4SS

EXI3SS

EXI2SS

EXI1SS

EXI0SS

Bit

Function

EXIxSS

External Interrupt x Source Selection Field (x = 7 … 0)

00:

Input from associated EXzIN pin.

01:

Input from alternate pin.

10:

Input from pin EXzIN ORed with alternate pin.

11:

Input from pin EXzIN ANDed with alternate pin.

Table 5-9

Connection of Interface Inputs to External Interrupt Nodes

Bitfield

Associated Interface Line

Notes

EXI0SS

CAN1_RxD

The used pin depends on the

assignment for the respective module.

EXI1SS

CAN2_RxD

EXI2SS

RxD0

ASC0

EXI3SS

SCLK

SSC

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