PIC16F1507-ESLASHSS. datasheet(121/278 Pages) MICROCHIP

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DS40001586D-page 121

PIC16(L)F1507

15.2

ADC Operation

15.2.1

STARTING A CONVERSION

To enable the ADC module, the ADON bit of the

ADCON0 register must be set to a ‘1’. Setting the GO/

DONE bit of the ADCON0 register to a ‘1’ will start the

Analog-to-Digital conversion.

15.2.2

COMPLETION OF A CONVERSION

When the conversion is complete, the ADC module will:

• Clear the GO/DONE bit

• Set the ADIF Interrupt Flag bit

• Update the ADRESH and ADRESL registers with

new conversion result

15.2.3

TERMINATING A CONVERSION

If a conversion must be terminated before completion,

the GO/DONE bit can be cleared in software. The

ADRESH and ADRESL registers will be updated with

the partially complete Analog-to-Digital conversion

sample. Incomplete bits will match the last bit

converted.

15.2.4

ADC OPERATION DURING SLEEP

The ADC module can operate during Sleep. This

requires the ADC clock source to be set to the FRC

option. Performing the ADC conversion during Sleep

can reduce system noise. If the ADC interrupt is

enabled, the device will wake-up from Sleep when the

conversion completes. If the ADC interrupt is disabled,

the ADC module is turned off after the conversion com-

pletes, although the ADON bit remains set.

When the ADC clock source is something other than

FRC, a SLEEP instruction causes the present conver-

sion to be aborted and the ADC module is turned off,

although the ADON bit remains set.

15.2.5

AUTO-CONVERSION TRIGGER

The auto-conversion trigger allows periodic ADC mea-

surements without software intervention. When a rising

edge of the selected source occurs, the GO/DONE bit

is set by hardware.

The auto-conversion trigger source is selected with the

TRIGSEL<3:0> bits of the ADCON2 register.

Using the auto-conversion trigger does not assure

proper ADC timing. It is the user’s responsibility to

ensure that the ADC timing requirements are met.

See Table 15-2 for auto-conversion sources.

Note:

The GO/DONE bit should not be set in the

same instruction that turns on the ADC.

Refer to Section 15.2.6 “ADC Conver-

sion Procedure”

Note:

A device Reset forces all registers to their

Reset state. Thus, the ADC module is

turned off and any pending conversion is

terminated.

TABLE 15-2:

AUTO-CONVERSION

SOURCES

Source Peripheral

Signal Name

Timer0

T0_overflow

Timer1

T1_overflow

Timer2

T2_match

CLC1

LC1_out

CLC2

LC2_out

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