OPTION_REG datasheet(125/222 Pages) MICROCHIP

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DS22331A-page 125

MCP19111

FIGURE 22-2:

ANALOG-TO-DIGITAL CONVERSION TAD CYCLES

22.1.4

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 GIE and PEIE bits of the INTCON

the INTCON register are enabled, execution will switch

to the Interrupt Service Routine.

22.1.5

RESULT FORMATTING

The 10-bit A/D conversion result is supplied in right jus-

tified format only.

Figure 22-3 shows the output format.

FIGURE 22-3:

10-BIT A/D RESULT FORMAT

TAD1 TAD2 TAD3 TAD4 TAD5 TAD6 TAD7 TAD8

TAD11

Set GO/DONE bit

Holding capacitor is disconnected from analog input (typically 100 ns)

TAD9 TAD10

TCY - TAD

ADRESH:ADRESL is loaded, GO bit is cleared,

ADIF bit is set, holding capacitor is connected to analog input.

Conversion starts

On the following cycle:

Note 1: The ADIF bit is set at the completion of

every conversion, regardless of whether

or not the ADC interrupt is enabled.

2: The ADC operates during Sleep-only

when the FRC oscillator is selected.

(ADFM = 1)

MSB

LSB

bit 7

bit 0

bit 7

bit 0

Read as ‘0’

10-bit A/D Result

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