C167CS datasheet(111/517 Pages) INFINEON

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C167CS

Derivatives

Interrupt and Trap Functions

User’s Manual

5-28

V2.0, 2000-07

Fast External Interrupts

The input pins that may be used for external interrupts are sampled every 16 TCL, i.e.

external events are scanned and detected in timeframes of 16 TCL (8 TCL for CAPIN).

The C167CS provides 8 interrupt inputs that are sampled every 2 TCL, so external

events are captured faster than with standard interrupt inputs.

The upper 8 pins of Port 2 (P2.15-P2.8) can individually be programmed to this fast

interrupt mode, where also the trigger transition (rising, falling or both) can be selected.

The External Interrupt Control register EXICON controls this feature for all 8 pins.

Note: The fast external interrupt inputs are sampled every 2 TCL. The interrupt request

arbitration and processing, however, is executed every 8 TCL.

These fast external interrupts use the interrupt nodes and vectors of the CAPCOM

channels CC8-CC15, so the capture/compare function cannot be used on the respective

Port 2 pins (with EXIxES

≠ 00

B). However, general purpose IO is possible in all cases.

EXICON

Ext. Interrupt Control Reg.

ESFR (F1C0H/E0H)

Reset Value: 0000H

98765

43210

EXI7ES

EXI6ES

EXI5ES

EXI4ES

EXI3ES

EXI2ES

EXI1ES

EXI0ES

Bit

Function

EXIxES

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

0 0:

Fast external interrupts disabled: standard mode

0 1:

Interrupt on positive edge (rising)

1 0:

Interrupt on negative edge (falling)

1 1:

Interrupt on any edge (rising or falling)

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