PIC16F526-ISLASHP datasheet(60/122 Pages) MICROCHIP

60 / 122 page

PIC16F526

DS41326D-page 60

 2010 Microchip Technology Inc.

9.1.5

SLEEP

This ADC does not have a dedicated ADC clock, and

therefore, no conversion in Sleep is possible. If a

conversion is underway and a Sleep command is

executed, the GO/DONE and ADON bit will be cleared.

This will stop any conversion in process and power-

down the ADC module to conserve power. Due to the

nature of the conversion process, the ADRES may con-

tain a partial conversion. At least 1 bit must have been

converted prior to Sleep to have partial conversion data

in ADRES. The ADCS and CHS bits are reset to their

default condition; ANS<1:0> = 11 and CHS<1:0> = 11.

• For accurate conversions, TAD must meet the

following:

•500 ns < TAD < 50

s

•TAD = 1/(FOSC/divisor)

Shaded areas indicate TAD out of range for accurate

conversions. If analog input is desired at these

frequencies, use INTOSC/8 for the ADC clock source.

TABLE 9-2:

TAD FOR ADCS SETTINGS WITH VARIOUS OSCILLATORS

TABLE 9-3:

EFFECTS OF SLEEP ON ADCON0

Source

ADCS

<1:0>

Divisor

MHz

8MHz 4MHz 1MHz

500

kHz

350

kHz

200

kHz

100

kHz

32 kHz

INTOSC

—

—.5

s1 s

—

FOSC

s

.25

s.5 s1 s4 s8 s11 s20 s40 s

125

s

FOSC

s.5 s1 s2 s8 s16 s23 s40 s

s

250

s

FOSC

s1 s2 s4 s16 s32 s46 s

s 160 s 500 s

ANS1

ANS0

ADCS1

ADCS0

CHS1

CHS0

GO/DONE

ADON

Entering

Sleep

Unchanged Unchanged

111

100

Wake or

Reset

111

100

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