H838532H datasheet(378/508 Pages) RENESAS

Part #	H838532H

Description	16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series

PDF	508 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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Section 12 A/D Converter

Rev. 1.00 May 30, 2008 Page 358 of 484

REJ09B0436-0100

12.5

Typical Use

An example of how the A/D converter can be used is given below, using channel 1 (pin AN1) as

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 0101, making pin AN

1 the analog

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 is stored in ADRRH and ADRRL. 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 to 6 take place.

Figures 12.4 and 12.5 show flow charts of procedures for using the A/D converter.

H838532H Datasheet(PDF) 378 Page - Renesas Technology Corp