Datasheet

Channel 0
SD24SNGL = 1
SD24GRP = 0
Time
Conversion
SD24SC
Channel 1
SD24SNGL = 1
SD24GRP = 0
Conversion
Channel 2
SD24SNGL = 0
SD24GRP = 0
Conversion
SD24SC
SD24SC
Conversion Conversion
Conversion
Set by SW
Auto−clear
Set by SW
Auto−clear
Set by SW
Auto−clear
Set by SW
Conv
Cleared by SW
= Result written to SD24MEMx
SD24_A Operation www.ti.com
27.2.9 Conversion Modes
The SD24_A module can be configured for four modes of operation, listed in Table 27-4. The SD24SNGL
and SD24GRP bits for each channel selects the conversion mode.
Table 27-4. Conversion Mode Summary
SD24SNGL SD24GRP
(1)
Mode Operation
1 0 Single channel, Single conversion A single channel is converted once.
0 0 Single channel, Continuous conversion A single channel is converted continuously.
1 1 Group of channels, Single conversion A group of channels is converted once.
A group of channels is converted
0 1 Group of channels, Continuous conversion
continuously.
(1)
A channel is grouped and is the master channel of the group when SD24GRP = 0 if SD24GRP for the prior channel(s) is set.
27.2.9.1 Single Channel, Single Conversion
Setting the SD24SC bit of a channel initiates one conversion on that channel when SD24SNGL = 1 and it
is not grouped with any other channels. The SD24SC bit will automatically be cleared after conversion
completion.
Clearing SD24SC before the conversion is completed immediately stops conversion of the selected
channel, the channel is powered down and the corresponding digital filter is turned off. The value in
SD24MEMx can change when SD24SC is cleared. It is recommended that the conversion data in
SD24MEMx be read prior to clearing SD24SC to avoid reading an invalid result.
27.2.9.2 Single Channel, Continuous Conversion
When SD24SNGL = 0 continuous conversion mode is selected. Conversion of the selected channel will
begin when SD24SC is set and continue until the SD24SC bit is cleared by software when the channel is
not grouped with any other channel.
Clearing SD24SC immediately stops conversion of the selected channel, the channel is powered down
and the corresponding digital filter is turned off. The value in SD24MEMx can change when SD24SC is
cleared. It is recommended that the conversion data in SD24MEMx be read prior to clearing SD24SC to
avoid reading an invalid result.
Figure 27-7 shows single channel operation for single conversion mode and continuous conversion mode.
Figure 27-7. Single Channel Operation - Example
626
SD24_A SLAU144J–December 2004–Revised July 2013
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