PIC16F7X7 datasheet(160/276 Pages) MICROCHIP

160 / 276 page

PIC16F7X7

DS30498C-page 158

 2004 Microchip Technology Inc.

12.4

Operation in Power-Managed

Modes

The selection of the automatic acquisition time and

A/D conversion clock is determined in part by the clock

source and frequency while in a power-managed

mode.

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

power-managed

mode,

the

ACQT2:ACQT0

(ADCON2<5:3>) and ADCS2:ADCS0 (ADCON1<6>,

ADCON0<7:6>) bits should be updated in accordance

with the power-managed mode clock that will be used.

After the power-managed mode is entered (either of

the power-managed 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 power-managed mode clock

source until the conversion has been completed.

If the power-managed mode clock frequency is less

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

selected.

Operation in 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 Sleep mode.

12.5

Configuring Analog Port Pins

The ADCON1, TRISA, TRISB and TRISE registers

control the operation of the A/D port pins. The port pins

that are desired 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

not

affect

the

conversion accuracy.

2: Analog levels on any pin that is defined as

a digital input, but not as an analog input,

may cause the digital input buffer to

consume current that is out of the

device’s specification.

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