PIC18F23K22-ESLASHML datasheet(151/496 Pages) MICROCHIP

151 / 496 page

 2010 Microchip Technology Inc.

Preliminary

DS41412C-page 151

PIC18(L)F2X/4XK22

10.7

Port Analog Control

Most port pins are multiplexed with analog functions

such

the

Analog-to-Digital

Converter

and

comparators. When these I/O pins are to be used as

analog inputs it is necessary to disable the digital input

buffer to avoid excessive current caused by improper

biasing of the digital input. Individual control of the

digital input buffers on pins which share analog

functions is provided by the ANSELA, ANSELB,

ANSELC, ANSELD and ANSELE registers. Setting an

ANSx bit high will disable the associated digital input

buffer and cause all reads of that pin to return ‘0’ while

allowing analog functions of that pin to operate

correctly.

The state of the ANSx bits has no affect on digital

output functions. A pin with the associated TRISx bit

clear and ANSx bit set will still operate as a digital

output but the input mode will be analog. This can

cause unexpected behavior when performing read-

modify-write operations on the affected port.

All ANSEL register bits default to ‘1’ upon POR and

BOR, disabling digital inputs for their associated port

pins. All TRIS register bits default to ‘1’ upon POR or

BOR, disabling digital outputs for their associated port

pins. As a result, all port pins that have an ANSEL

10.8

Port Slew Rate Control

The output slew rate of each port is programmable to

select either the standard transition rate or a reduced

transition rate of approximately 0.1 times the standard

to minimize EMI. The reduced transition time is the

default slew rate for all ports.

TABLE 10-16: CONFIGURATION REGISTERS ASSOCIATED WITH PORTE

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Reset

Values

on page

CONFIG3H

MCLRE

—

P2BMX

T3CMX

HFOFST CCP3MX PBADEN CCP2MX

354

CONFIG4L

DEBUG

XINST

—

LVP(1)

—

STRVEN

355

Legend: — = unimplemented locations, read as ‘0’. Shaded bits are not used for Interrupts.

Note 1:

Can only be changed when in high voltage programming mode.

PORTX(1): PORTx REGISTER

R/W-u/x

Rx7

Rx6

Rx5

Rx4

Rx3

Rx2

Rx1

Rx0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

bit 7-0

Rx<7:0>: PORTx I/O bit values(2)

Note 1:

Writes to PORTx are written to corresponding LATx register. Reads from PORTx register is return of I/O

pin values.

PIC18F23K22-E/ML датащи(PDF) 151 Page - Microchip Technology

PIC18F23K22-E/ML датащи(HTML) 151 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL