rtd DM6210, User Manual

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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