ADUC7021 datasheet(39/92 Pages) AD

39 / 92 page

ADuC7019/20/21/22/24/25/26/27

Rev. A | Page 39 of 92

Table 14. ADCCON MMR Bit Designations

Bit

Value

Description

15:13

Reserved.

12:10

ADC clock speed.

000

fADC/1. This divider is provided to obtain

1 MSPS ADC with an external clock <41.78 MHz.

001

fADC/2 (default value).

010

fADC/4.

011

fADC/8.

100

fADC/16.

101

fADC/32.

9:8

ADC acquisition time.

2 clocks.

4 clocks.

8 clocks (default value).

16 clocks.

Enable start conversion.

Set by the user to start any type of conversion

command. Cleared by the user to disable a

start conversion (clearing this bit does not

stop the ADC when continuously converting).

Enable ADCBUSY.

Set by the user to enable the ADCBUSY pin.

Cleared by the user to disable the ADCBUSY pin.

ADC power control.

Set by the user to place the ADC in normal

mode (the ADC must be powered up for at least

5 μs before it converts correctly). Cleared by the

user to place the ADC in power-down mode.

4:3

Conversion mode.

Single-ended mode.

Differential mode.

Pseudo differential mode.

Reserved.

2:0

Conversion type.

000

Enable CONVSTART pin as a conversion input.

001

Enable Timer1 as a conversion input.

010

Enable Timer0 as a conversion input.

011

Single software conversion; sets to 000 after

conversion (Bit 7 of ADCCON MMR should be

cleared after starting a single software

conversion to avoid further conversions

triggered by the CONVSTART pin).

100

Continuous software conversion.

101

PLA conversion.

Other

Reserved.

ADCCP Register

Name

Address

Default Value

Access

ADCCP

0xFFFF0504

0x00

R/W

ADCCP is an ADC positive channel selection register. This

MMR is described in Table 15.

Table 15. ADCCP1 MMR Bit Designation

Bit

Value

Description

7:5

Reserved

4:0

Positive channel selection bits

00000

ADC0

00001

ADC1

00010

ADC2

00011

ADC3

00100

ADC4

00101

ADC5

00110

ADC6

00111

ADC7

01000

ADC8

01001

ADC9

01010

ADC10

01011

ADC11

01100

DAC0/ADC12

01101

DAC1/ADC13

01110

DAC2/ADC14

01111

DAC3/ADC15

10000

Temperature sensor

10001

AGND (self-diagnostic feature)

10010

Internal reference (self-diagnostic feature)

10011

AVDD/2

Others

Reserved

1 ADC and DAC channel availability depends on part model. See the Ordering

Guide for details.

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