PIC16F913 datasheet(147/272 Pages) MICROCHIP

147 / 272 page

Preliminary

DS41250E-page 145

PIC16F917/916/914/913

12.1.5

STARTING A CONVERSION

The A/D conversion is initiated by setting the

GO/DONE bit (ADCON0<1>). When the conversion is

complete, the A/D module:

• Clears the GO/DONE bit

• Sets the ADIF flag (PIR1<6>)

• Generates an interrupt (if enabled)

If the conversion must be aborted, the GO/DONE bit

can be cleared in software. The ADRESH:ADRESL

registers will not be updated with the partially complete

A/D

conversion

sample.

Instead,

the

ADRESH:ADRESL registers will retain the value of the

previous conversion. After an aborted conversion, a

2TAD delay is required before another acquisition can

be initiated. Following the delay, an input acquisition is

automatically started on the selected channel.

FIGURE 12-2:

A/D CONVERSION TAD CYCLES

12.1.6

CONVERSION OUTPUT

The A/D conversion can be supplied in two formats: left

or right shifted. The ADFM bit (ADCON0<7>) controls

the output format. Figure 12-3 shows the output

formats.

FIGURE 12-3:

10-BIT A/D RESULT FORMAT

Note:

The GO/DONE bit should not be set in the

same instruction that turns on the A/D.

TAD1 TAD2 TAD3 TAD4 TAD5 TAD6 TAD7 TAD8 TAD9

Set GO/DONE bit

Holding Capacitor is Disconnected from Analog Input (typically 100 ns)

TAD10 TAD11

TCY TO TAD

Conversion Starts

ADRESH and ADRESL registers are loaded,

GO/DONE bit is cleared,

ADIF bit is set,

Holding Capacitor is Connected to Analog Input

ADRESH

ADRESL

(ADFM = 0)MSB

LSB

bit 7

bit 0

bit 7

bit 0

10-bit A/D Result

Unimplemented: Read as ‘0’

(ADFM = 1)

MSB

LSB

bit 7

bit 0

bit 7

bit 0

Unimplemented: Read as ‘0’

10-bit A/D Result

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