Texas Instruments DMSoC Analog to Digital Converter Interface TMS320DM36x - Manual (Page 14)

3.4 CMPUDAT
3.5 SETDIV
3.6 CHSEL
Registers www.ti.com
The comparison A/D Upper data (CMPUDAT) register is shown in Figure 5 and described in Table 5 .
Figure 5. Comparison A/D Upper Data (CMPUDAT) Register
31 10 9 0
Reserved CMPUDAT
R-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 5. Comparison A/D Upper Data (CMPUDAT) Field Descriptions
Bit Field Value Description
31-10 Reserved 0 Any writes to these bit(s) must always have a value of 0.
9-0 CMPUDAT Comparativer data (upper) value of CMPUDAT should be the same as or larger than that of
CMPLDAT.
The SETUP divide value for start A/D conversion (SETDIV) register is shown in Figure 6 and described in
Table 6 .
A/D conversion time is obtained by Analog switch setup time + ADC setup time + A/D conversion time.
Analog switch setup time = Peripheral CLK period * (SET_DIV[5:0] + 3)*2
ADC setup time = Peripheral CLK period * (SET_DIV[15:0] + 1)*2
A/D conversion time = Peripheral CLK period* (SET_DIV[5:0] + 1)*24.
Note: A/D conversion time can't be less than 6us.
Figure 6. Setup Divide Value for Start A/D (SETDIV) Register
31 16
Reserved
R-0
15 0
SETDIV
R/W-0xFFFF
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 6. Setup Divide Value for Start A/D (SETDIV) Field Descriptions
Bit Field Value Description
31-16 Reserved 0 Any writes to these bit(s) must always have a value of 0.
15-0 SETDIV SETDIV bits set the Analog switch setup time, ADC setup (Idle) time and A/D conversion time.
Analog switch setup time = Peripheral CLK period * (SET_DIV[5:0] + 3)*2
ADC setup time = Peripheral CLK period * (SET_DIV[15:0] + 1)*2
A/D conversion time = Peripheral CLK period* (SET_DIV[5:0] + 1)*24.
The analog Input channel select (CHSEL) register is shown in Figure 7 and described in Table 8 . CHSEL
setting for the selection of different channel is shown in Table 7 . In order to select two or more channels,
ORing of these setting is needed.
14 Analog to Digital Converter (ADC) Interface SPRUFI7 – March 2009
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