12F683 datasheet(95/148 Pages) MICROCHIP

95 / 148 page

 2004 Microchip Technology Inc.

Preliminary

DS41211B-page 93

PIC12F683

FIGURE 12-11:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

12.11 In-Circuit Debugger

Since in-circuit debugging requires the loss of clock,

data and MCLR pins, MPLAB® ICD 2 development with

an 8-pin device is not practical. A special 14-pin

PIC12F683 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 PIC12F683 device. The

debugging adapter is the only source of the ICD device.

When the ICD pin on the PIC12F683 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:

14-PIN ICD PINOUT

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC12F683

VDD

VSS

MCLR/VPP/GP3

GP1

GP0

+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

14-Pin PDIP

In-Circuit Debug Device

ICDMCLR/VPP

VDD

GP5

GP4

GP3

ICDCLK

ICDDATA

Vss

GP0

ICD

GP1

GP2

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