12F683 datasheet(59/148 Pages) MICROCHIP

59 / 148 page

 2004 Microchip Technology Inc.

Preliminary

DS41211B-page 57

PIC12F683

9.1.5

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 9-2:

A/D CONVERSION TAD CYCLES

9.1.6

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 9-3 shows the output formats.

FIGURE 9-3:

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 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 bit is Cleared,

ADIF bit is Set,

Holding Capacitor is Connected to Analog Input

ADRESH

ADRESL

(ADFM = 0)MSB

LSB

bit 7bit 0

10-bit A/D Result

Unimplemented: Read as ‘0’

(ADFM = 1)

MSB

LSB

bit 7bit 0

Unimplemented: Read as ‘0’

10-bit A/D Result

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