Datasheet

PIC16F688

8.1.5 INTERRUPTS

The ADC module allows for the ability to generate an

interrupt upon completion of an Analog-to-Digital

Conversion. The ADC interrupt flag is the ADIF bit in

the PIR1 register. The ADC interrupt enable is the ADIE

bit in the PIE1 register. The ADIF bit must be cleared in

software.

This interrupt can be generated while the device is

operating or while in Sleep. If the device is in Sleep, the

interrupt will wake-up the device. Upon waking from

Sleep, the next instruction following the SLEEP

instruction is always executed. If the user is attempting

to wake-up from Sleep and resume in-line code

execution, the global interrupt must be disabled. If the

global interrupt is enabled, execution will switch to the

Interrupt Service Routine.

Please see Section 8.1.5 “Interrupts” for more

information.

8.1.6 RESULT FORMATTING

The 10-bit A/D Conversion result can be supplied in

two formats, left justified or right justified. The ADFM bit

of the ADCON0 register controls the output format.

Figure 8-4 shows the two output formats.

FIGURE 8-3: 10-BIT A/D CONVERSION RESULT FORMAT

Note: The ADIF bit is set at the completion of

every conversion, regardless of whether

or not the ADC interrupt is enabled.

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