PIC18LF4331 datasheet(254/392 Pages) MICROCHIP

Part #	PIC18LF4331

Description	28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D

PDF	392 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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254 / 392 page

PIC18F2331/2431/4331/4431

DS39616D-page 254

 2010 Microchip Technology Inc.

21.9.1

A/D RESULT REGISTER

The ADRESH:ADRESL register pair is the location

where the 10-bit A/D result is loaded at the completion

of the A/D conversion. This register pair is 16 bits wide.

The A/D module gives the flexibility to left or right justify

the 10-bit result in the 16-bit result register. The A/D

Format Select bit (ADFM) controls this justification.

Figure 21-5 shows the operation of the A/D result

justification. The extra bits are loaded with ‘0’s. When

an A/D result will not overwrite these locations (A/D

disable), these registers may be used as two general

purpose 8-bit registers.

FIGURE 21-5:

A/D RESULT JUSTIFICATION

EQUATION 21-3:

CONVERSION TIME FOR MULTI-CHANNEL MODES

10-Bit Result

ADRESH

ADRESL

0000 00

ADFM = 0

2 1 0 7

10-Bit Result

ADRESH

ADRESL

10-Bit Result

0000 00

0 7 6 5

ADFM = 1

Right Justified

Left Justified

Sequential Mode:

Simultaneous Mode:

T = (TACQ)A + (TCON)A + [(TACQ)B – 12 TAD] + (TCON)B + [(TACQ)C – 12 TAD] + (TCON)C + [(TACQ)D – 12 TAD] + (TCON)D

T = TACQ + (TCON)A + (TCON)B + TACQ + (TCON)C + (TCON)D

PIC18LF4331 Datasheet(PDF) 254 Page - Microchip Technology