DM6210 datasheet(45/91 Pages) ETC

45 / 91 page

5-3

The following paragraphs walk you through the programming steps for performing A/D conversions. In this

discussion, BA refers to the base address.

Selecting a Channel

To select a conversion channel, you must assign values to bits 0 through 3 in the Channel register at BA + 4.

Starting an A/D Conversion

A/D conversions are started by writing to BA + 0. A START CONVERT command must be issued for each A/D

conversion. The data written to start a conversion is irrelevant.

Monitoring Conversion Status

The A/D conversion status can be monitored through the end-of-convert (EOC) signal, bit 0 at BA + 6.

This signal is low when a conversion is in progress and goes high when the conversion is completed. This

low-to-high transition can be used to generate an interrupt or you can poll this bit to see the status of the

conversion.

Analog Input

Channel Select

0000 = channel 1

0001 = channel 2

0010 = channel 3

0011 = channel 4

0100 = channel 5

0101 = channel 6

0110 = channel 7

0111 = channel 8

IRQ Status

0 = no interrupt

1 = interrupt

P0 Latch Status

0 = Data is not latched

1 = Data is latched

P1 Latch Status

0 = Data is not latched

1 = Data is latched

End-of-Convert Status

0 = converting

1 = not converting

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