PIC16F688-ESLASHST datasheet(71/174 Pages) MICROCHIP

71 / 174 page

 2004 Microchip Technology Inc.

Preliminary

DS41203B-page 69

PIC16F688

8.3

A/D Operation During Sleep

The A/D converter module can operate during Sleep.

This requires the A/D clock source to be set to the

internal oscillator. When the RC clock source is

selected, the A/D waits one instruction before starting

the conversion. This allows the SLEEP instruction to be

executed, thus eliminating much of the switching noise

from the conversion. When the conversion is complete,

the GO/DONE bit is cleared and the result is loaded

into the ADRESH:ADRESL registers. If the A/D

interrupt is enabled, the device awakens from Sleep. If

the GIE bit (INTCON<7>) is set, the program counter is

set to the interrupt vector (0004h), if GIE is clear, the

next instruction is executed. If the A/D interrupt is not

enabled, the A/D module is turned off, although the

ADON bit remains set.

When the A/D clock source is something other than

RC, a SLEEP instruction causes the present conversion

to be aborted, and the A/D module is turned off. The

ADON bit remains set.

FIGURE 8-5:

A/D TRANSFER FUNCTION

3FFh

3FEh

3FDh

3FCh

004h

003h

002h

001h

000h

Full-Scale

3FBh

1/2 LSB Ideal

Zero-Scale

Transition

1/2 LSB Ideal

Transition

Center of

Full-Scale Code

1 LSB Ideal

Full-Scale Range

Analog Input

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