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19 Chapter 3

3.3.2 Interrupt Source Control

The "mode bits" in the interrupt control register determine the allowable

sources of signals generating an interrupt. Bit 0 and bit 1 determine the

interrupt source, as indicated in Figure 3-1. Table 3-3 shows the relation-

ship between an interrupt source and the values in the mode bits.

Figure 3.1: Interrupt Sources

3.3.3 Interrupt Triggering Edge Control

The interrupt can be triggered by a rising edge or a falling edge of the

interrupt signal, selectable by the value written in the "triggering edge

control" bit in the interrupt control register, as shown in Table 3.4.

Table 3.3: Interrupt Mode Bit Values

M1 M0 Description

0 0 Disable interrupt

01Source = PC00

1 0 Source = PC00 & PC04

1 1 No used

Table 3.4: Triggering Edge Control Bit Values

E Triggering edge of interrupt signal

1 Rising edge trigger

0 Falling edge trigger

1 2 ... 20 21 22 23 24 25 26 27 28

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