PIC16LF1902-ESS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LF1902-ESS

28-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

Microchip Technology 

PIC16LF1902/3

19.0 IN-CIRCUIT SERIAL

PROGRAMMING™ (ICSP™)

ICSP™ programming allows customers to manufacture

circuit boards with unprogrammed devices. Programming

can be done after the assembly process allowing the

device to be programmed with the most recent firmware

or a custom firmware. Five pins are needed for ICSP™

programming:

• ICSPCLK

• ICSPDAT

• MCLR/VPP

• VDD

• VSS

In Program/Verify mode the Program Memory, User

IDs and the Configuration Words are programmed

through serial communications. The ICSPDAT pin is a

bidirectional I/O used for transferring the serial data

and the ICSPCLK pin is the clock input. For more

information on ICSP™ refer to the

“PIC16F193X/LF193X/PIC16F194X/LF194X/PIC16LF

190X Memory

(DS41397).

Programming

Specification”

19.1 High-Voltage Programming Entry

Mode

The device is placed into High-Voltage Programming

Entry mode by holding the ICSPCLK and ICSPDAT

pins low then raising the voltage on MCLR/VPP to VIHH.

Some programmers produce VPP greater than VIHH

(9.0V), an external circuit is required to limit the VPP

voltage. See Figure 19-1 for example circuit.

FIGURE 19-1:

VPP LIMITER EXAMPLE CIRCUIT

VPP

VDD

VSS

ICSP_DATA

ICSP_CLOCK

NC

1

2

3

4

5

6

RJ11-6PIN

To MPLAB® ICD 2

R1

270 Ohm

LM431BCMX

2

3

6

7

A

A

A

A

U1 K 1

NC

NC

4

5

VREF

8

R2

R3

10k 1% 24k 1%

RJ11-6PIN

6

5

4

3

2

1

To Target Board

Note:

The MPLAB® ICD 2 produces a VPP

voltage greater than the maximum VPP

specification of the PIC16LF1902/3.

 2011 Microchip Technology Inc.

Preliminary

DS41455A-page 177

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