PIC16F684-ESLASHST datasheet(111/164 Pages) MICROCHIP

111 / 164 page

 2004 Microchip Technology Inc.

Preliminary

DS41202C-page 109

PIC16F684

FIGURE 12-11:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

12.11 In-Circuit Debugger

Since in-circuit debugging requires access to the data

and MCLR pins, MPLAB® ICD 2 development with an

14-pin device is not practical. A special 20-pin

PIC16F684 ICD device is used with MPLAB ICD 2 to

provide separate clock, data and MCLR pins and frees

all normally available pins to the user.

A special debugging adapter allows the ICD device to

be used in place of a PIC16F684 device. The

debugging adapter is the only source of the ICD device.

When the ICD pin on the PIC16F684 ICD device is held

low, the In-Circuit Debugger functionality is enabled.

This function allows simple debugging functions when

used with MPLAB ICD 2. When the microcontroller has

this feature enabled, some of the resources are not

available for general use. Table 12-9 shows which

features are consumed by the background debugger.

TABLE 12-9:

DEBUGGER RESOURCES

For more information, see “MPLAB® ICD 2 In-Circuit

Debugger User’s Guide” (DS51331), available on

Microchip’s web site (www.microchip.com).

FIGURE 12-12:

20-PIN ICD PINOUT

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC16F684

VDD

VSS

MCLR/VPP/RA3

RA1

RA0

+5V

VPP

CLK

Data I/O

* Isolation devices (as required)

Resource

Description

I/O pins

ICDCLK, ICDDATA

Stack

1 level

Program Memory

Address 0h must be NOP

700h-7FFh

20-Pin PDIP

In-Circuit Debug Device

ICDMCLR/VPP

VDD

RA5

RA4

RA3

ICDCLK

ICDDATA

Vss

RA0

ICD

RA1

RA2

RC5

RC4

RC3

RC0

RC1

RC2

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