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A/D conversion end interrupts can be enabled or disabled by means of bit IENAD in interrupt
enable register 2 (IENR2).
For further details see 3.3, Interrupts.
12.5
Typical Use
An example of how the A/D converter can be used is given below, using channel 4 (pin AN
the analog input channel. Figure 12.3 shows the operation timing.
1. Bits CH3 to CH0 of the A/D mode register (AMR) are set to 1000, making pin AN
input channel. A/D interrupts are enabled by setting bit IENAD to 1, and A/D conversion is
started by setting bit ADSF to 1.
2. When A/D conversion is complete, bit IRRAD is set to 1, and the A/D conversion result is
stored in the A/D result register (ADRR). At the same time ADSF is cleared to 0, and the A/D
converter goes to the idle state.
3. Bit IENAD = 1, so an A/D conversion end interrupt is requested.
4. The A/D interrupt handling routine starts.
5. The A/D conversion result is read and processed.
6. The A/D interrupt handling routine ends.
If ADSF is set to 1 again afterward, A/D conversion starts and steps 2 through 6 take place.
Figures 12.4 and 12.5 show flow charts of procedures for using the A/D converter.
288
) as
4
the analog
4
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