PIC16LF18326 datasheet(21/489 Pages) MICROCHIP

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 2015-2017 Microchip Technology Inc.

DS40001800C-page 21

PIC16(L)F18324/18344

2.3

Master Clear (MCLR) Pin

The MCLR pin provides three specific device functions:

• Device Reset (when MCLRE = 1)

• Digital input pin (when MCLRE = 0)

• Device Programming and Debugging

If programming and debugging are not required in the

end

application

then

either

set

the

MCLRE

configuration bit to ‘1’ and use the pin as a digital input

or clear the MCLRE Configuration bit and leave the pin

open to use the internal weak pull-up. The addition of

other components, to help increase the application’s

resistance to spurious Resets from voltage sags, may

be beneficial. A typical configuration is shown in

Figure 2-1. Other circuit designs may be implemented,

depending on the application’s requirements.

During programming and debugging, the resistance

and capacitance that can be added to the pin must be

considered. Device programmers and debuggers drive

the MCLR pin. Consequently, specific voltage levels

(VIH and VIL) and fast signal transitions must not be

adversely affected.

Therefore,

the

programmer

MCLR/VPP output should be connected directly to the

pin so that R1 isolates the capacitor, C1 from the MCLR

pin during programming and debugging operations.

Any components associated with the MCLR pin should

be placed within 0.25 inch (6 mm) of the pin.

2.4

ICSP™ Pins

The ICSPCLK and ICSPDAT pins are used for

In-Circuit

Serial

Programming™

(ICSP™)

and

debugging purposes. It is recommended to keep the

trace length between the ICSP connector and the ICSP

pins on the device as short as possible. If the ICSP

connector is expected to experience an ESD event, a

series resistor is recommended, with the value in the

range of a few tens of ohms, not to exceed 100Ω.

Pull-up resistors, series diodes and capacitors on the

ICSPCLK and ICSPDAT pins are not recommended as

they will interfere with the programmer/debugger

communications to the device. If such discrete

components are an application requirement, they

should be isolated from the programmer by resistors

between the application and the device pins or

removed from the circuit during programming.

Alternatively, refer to the AC/DC characteristics and

timing requirements information in the respective

device Flash programming specification for information

on capacitive loading limits, and pin input voltage high

(VIH) and input low (VIL) requirements.

For device emulation, ensure that the “Communication

Channel Select” (i.e., ICSPCLK/ICSPDAT pins),

programmed into the device, matches the physical

connections for the ICSP to the Microchip debugger/

emulator tool.

For

information

available

Microchip

development tools connection requirements, refer to

Section 37.0 “Development Support”

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