Texas Instruments TMS320DM36X manual Cmpudat, Setdiv, Chsel

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3.4CMPUDAT

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.

3.5SETDIV

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.

3.6CHSEL

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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