PIC16F1508TESSQTO datasheet(139/384 Pages) MICROCHIP

139 / 384 page

 2011 Microchip Technology Inc.

Preliminary

DS41609A-page 139

PIC16(L)F1508/9

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. When the FRC clock source is selected, the

ADC waits one additional instruction before starting the

conversion. This allows the SLEEP instruction to be

executed, which can reduce system noise during the

conversion. 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 completes,

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.

Auto-Conversion sources are:

•TMR0

•TMR1

•TMR2

•C1

•C2

•CLC1

•CLC2

•CLC3

•CLC4

Note:

The GO/DONE bit should not be set in the

same instruction that turns on the ADC.

Refer to Section 15.2.6 “A/D 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.

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