PIC16F18323-ESLASHRFQTP datasheet(128/442 Pages) MICROCHIP

128 / 442 page

PIC16(L)F18313/18323

DS40001799A-page 128

Preliminary

 2015 Microchip Technology Inc.

11.2.5

INPUT THRESHOLD CONTROL

The INLVLA register (Register 11-8) controls the input

voltage threshold for each of the available PORTA input

pins. A selection between the Schmitt Trigger CMOS or

the TTL Compatible thresholds is available. The input

threshold is important in determining the value of a read

of the PORTA register and also the level at which an

interrupt-on-change occurs, if that feature is enabled.

See Table 34-4 for more information on threshold

levels.

11.2.6

ANALOG CONTROL

The ANSELA register (Register 11-4) is used to

configure the Input mode of an I/O pin to analog.

Setting the appropriate ANSELA bit high will cause all

digital reads on the pin to be read as ‘0’ and allow

analog functions on the pin to operate correctly.

The state of the ANSELA bits has no effect on digital

output functions. A pin with its TRIS bit clear and its

ANSEL bit set will still operate as a digital output, but

the Input mode will be analog. This can cause unex-

pected behavior when executing read-modify-write

instructions on the affected port.

11.2.7

WEAK PULL-UP CONTROL

The WPUA register (Register 11-5) controls the

individual weak pull-ups for each port pin.

PORTA pin RA3 includes the MCLR/VPP input. The

MCLR input allows the device to be reset, and can be

disabled by the MCLRE bit of Configuration Word 2. A

weak pull-up is present on the RA3 port pin. This weak

pull-up is enabled when MCLR is enabled (MCLRE = 1)

or the WPUA3 bit is set. The weak pull-up is disabled

when is disabled and the WPUA3 bit is clear.

11.2.8

PORTA FUNCTIONS AND OUTPUT

PRIORITIES

Each PORTA pin is multiplexed with other functions.

Each pin defaults to the PORT latch data after Reset.

Other output functions are selected with the peripheral

pin select logic or by enabling an analog output, such

as the DAC. See Section 12.0, Peripheral Pin Select

(PPS) Module for more information.

Analog input functions, such as ADC and comparator

inputs are not shown in the peripheral pin select lists.

Digital output functions may continue to control the pin

when it is in Analog mode.

Note:

Changing the input threshold selection

should be performed while all peripheral

modules are disabled. Changing the

threshold level during the time a module is

active may inadvertently generate a

transition associated with an input pin,

regardless of the actual voltage level on

that pin.

Note:

The ANSELA bits default to the Analog

mode after Reset. To use any pins as

digital general purpose or peripheral

inputs, the corresponding ANSEL bits

must be initialized to ‘0’ by user software.

PIC16F18323-E/RFQTP Datasheet(PDF) 128 Page - Microchip Technology

PIC16F18323-E/RFQTP Datasheet(HTML) 128 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

Datasheet Download

Link URL