C167CS datasheet(108/517 Pages) INFINEON

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C167CS

Derivatives

Interrupt and Trap Functions

User’s Manual

5-25

V2.0, 2000-07

5.7

Interrupt Node Sharing

Interrupt nodes may be shared between several module requests either if the requests

are generated mutually exclusive or if the requests are generated at a low rate. If more

than one source is enabled in this case the interrupt handler will first have to determine

the requesting source. However, this overhead is not critical for low rate requests.

This node sharing is controlled via the sub-node interrupt control register ISNC which

provides a separate request flag and enable bit for each supported request source. The

interrupt level used for arbitration is determined by the node control register (… IC).

Note: In order to ensure compatibility with other derivatives application software should

never set reserved bits within register ISNC.

ISNC

Interrupt Sub-Node Ctrl. Reg.

ESFR (F1DEH/EFH)

Reset Value: 0000H

98765

43210

------

----

PLL

RTC

Bit

Function

xxIR

Interrupt Request Flag for Source xx

No request from source xx pending.

Source xx has raised an interrupt request.

xxIE

Interrupt Enable Control Bit for Source xx

Source xx interrupt request is disabled.

Source xx interrupt request is enabled.

Table 5-7

Sub-Node Control Bit Allocation

Bit pos.

Interrupt Source

Associated Node

15 … 4

Reserved.

3|2

PLL / OWD

XP3IC

1|0

RTC

XP3IC

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