C167CS datasheet(109/517 Pages) INFINEON

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C167CS

Derivatives

Interrupt and Trap Functions

User’s Manual

5-26

V2.0, 2000-07

5.8

External Interrupts

Although the C167CS has no dedicated INTR input pins, it provides many possibilities

to react on external asynchronous events by using a number of IO lines for interrupt

input. The interrupt function may either be combined with the pin’s main function or may

be used instead of it, i.e. if the main pin function is not required.

Interrupt signals may be connected to:

• CC31IO … CC16IO, the capture input/compare output lines of the CAPCOM2 unit,

• CC15IO … CC0IO, the capture input/compare output lines of the CAPCOM1 unit,

• T4IN, T2IN, the timer input pins,

• CAPIN, the capture input of GPT2

For each of these pins either a positive, a negative, or both a positive and a negative

external transition can be selected to cause an interrupt or PEC service request. The

edge selection is performed in the control register of the peripheral device associated

with the respective port pin. The peripheral must be programmed to a specific operating

mode to allow generation of an interrupt by the external signal. The priority of the

interrupt request is determined by the interrupt control register of the respective

peripheral interrupt source, and the interrupt vector of this source will be used to service

the external interrupt request.

Note: In order to use any of the listed pins as external interrupt input, it must be switched

to input mode via its direction control bit DPx.y in the respective port direction

control register DPx.

When port pins CCxIO are to be used as external interrupt input pins, bit field CCMODx

in the control register of the corresponding capture/compare register CCx must select

capture mode. When CCMODx is programmed to 001B, the interrupt request flag CCxIR

in register CCxIC will be set on a positive external transition at pin CCxIO. When

CCMODx is programmed to 010B, a negative external transition will set the interrupt

request flag. When CCMODx = 011B, both a positive and a negative transition will set

Table 5-8

Pins to be Used as External Interrupt Inputs

Port Pin

Original Function

Control Register

P7.7-4/CC31-28IO

CAPCOM register 31-28 capture input

CC31-CC28

P1H.7-4/CC27-24IO

CAPCOM register 27-24 capture input

CC27-CC24

P8.7-0/CC23-16IO

CAPCOM register 23-16 capture input

CC23-CC16

P2.15-0/CC15-0IO

CAPCOM register 15-0 capture input

CC15-CC0

P3.7/T2IN

Auxiliary timer T2 input pin

T2CON

P3.5/T4IN

Auxiliary timer T4 input pin

T4CON

P3.2/CAPIN

GPT2 capture input pin

T5CON

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