PIC16F1933-ESLASHP datasheet(337/418 Pages) MICROCHIP

337 / 418 page

Preliminary

DS41364A-page 335

PIC16F193X/LF193X

25.0

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 infor-

mation

ICSP™

refer

the

“PIC16193X/PIC16LF193X

Memory

Programming

Specification” (DS41360A)

25.1

High-voltage Programming Mode

The device is placed into high-voltage Program/Verify

mode by holding the ICSPCLK and ICSPDAT pins low

then raising the voltage on MCLR/VPP to VIHH.

25.2

Low-Voltage Programming Mode

The Low-Voltage Programming mode allows the

PIC16F193X/LF193X devices to be programmed using

VDD only, without high voltage. When the LVP bit of the

Configuration Word 2 register is set to ‘1’, the

low-voltage ICSP programming entry is enabled. To

disable the Low-Voltage ICSP mode, the LVP bit must

be programmed to ‘0’.

Entry into the Low-Voltage ICSP Program/Verify modes

requires the following steps:

MCLR is brought to VIL.

32-bit

key

sequence

presented

ICSPDAT, while clocking ICSPCLK.

Once the key sequence is complete, MCLR must be

held at VIL for as long as Program/Verify mode is to be

maintained.

FIGURE 25-1:

TYPICAL CONNECTION FOR ICSP™ PROGRAMMING

Note:

The ICD 2 produces a VPP voltage greater

than the maximum VPP specification of the

PIC16F193X/LF193X. When using this

programmer, an external circuit is required

to keep the VPP voltage within the device

specifications.

VDD

VPP

VSS

External

Device to be

Data

Clock

VDD

MCLR/VPP

VSS

ICSPDAT

ICSPCLK

To Normal Connections

* Isolation devices (as required).

10k

Programming

Signals

Programmed

VDD

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