PIC18F1220ESLASHSOSQTP datasheet(164/308 Pages) MICROCHIP

164 / 308 page

PIC18F1220/1320

DS39605F-page 162

17.5

Operation in Low-Power Modes

The selection of the automatic acquisition time and the

A/D conversion clock is determined, in part, by the low-

power mode clock source and frequency while in a

low-power mode.

If the A/D is expected to operate while the device is

in a low-power mode, the ACQT2:ACQT0 and

ADCS2:ADCS0 bits in ADCON2 should be updated in

accordance with the low-power mode clock that will be

used. After the low-power mode is entered (either of

the Run modes), an A/D acquisition or conversion may

be started. Once an acquisition or conversion is

started, the device should continue to be clocked by the

same low-power mode clock source until the conver-

sion has been completed. If desired, the device may be

placed into the corresponding low-power (ANY)_IDLE

mode during the conversion.

If the low-power mode clock frequency is less than

1 MHz, the A/D RC clock source should be selected.

Operation in the Low-Power Sleep mode requires the

A/D RC clock to be selected. If bits, ACQT2:ACQT0, are

set to ‘000’ and a conversion is started, the conversion

will be delayed one instruction cycle to allow execution

of the SLEEP instruction and entry to Low-Power Sleep

mode. The IDLEN and SCS bits in the OSCCON register

must have already been cleared prior to starting the

conversion.

17.6

Configuring Analog Port Pins

The ADCON1, TRISA and TRISB registers all configure

the A/D port pins. The port pins needed as analog inputs

must have their corresponding TRIS bits set (input). If

the TRIS bit is cleared (output), the digital output level

(VOH or VOL) will be converted.

The A/D operation is independent of the state of the

CHS2:CHS0 bits and the TRIS bits.

Note 1: When reading the Port register, all pins

configured as analog input channels will

read as cleared (a low level). Pins con-

figured as digital inputs will convert an

analog input. Analog levels on a digitally

configured

input

will

accurately

converted.

2: Analog levels on any pin defined as a

digital input may cause the digital input

buffer to consume current out of the

device’s specification limits.

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