C167CS datasheet(113/517 Pages) INFINEON

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C167CS

Derivatives

Interrupt and Trap Functions

User’s Manual

5-30

V2.0, 2000-07

External Interrupts During Sleep Mode

During Sleep mode all peripheral clock signals are deactivated which also disables the

standard edge detection logic for the fast external interrupts. However, transitions on

these interrupt inputs must be recognized in order to initiate the wakeup. Therefore

during Sleep mode a special edge detection logic for the fast external interrupts (EXzIN)

is activated, which requires no clock signal (therefore also works in Sleep mode) and is

equipped with an analog noise filter. This filter suppresses spikes (generated by noise)

up to 10 ns. Input pulses with a duration of 100 ns minimum are recognized and

generate an interrupt request.

This filter delays the recognition of an external wakeup signal by approx. 100 ns, but the

spike suppression ensures safe and robust operation of the sleep/wakeup mechanism

in an active environment.

Figure 5-6

Input Noise Filter Operation

MCD04456

Input

Signal

Interrupt

Request

Rejected

Recognized

10 ns

100 ns

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