PIC16F87-ISLASHML datasheet(149/214 Pages) MICROCHIP

149 / 214 page

 2003 Microchip Technology Inc.

Preliminary

DS30487B-page 147

PIC16F87/88

15.14 In-Circuit Debugger

When the DEBUG bit in the configuration word is pro-

grammed to a ‘0’, the In-Circuit Debugger functionality

is enabled. This function allows simple debugging func-

tions when used with MPLAB® ICD. When the micro-

controller has this feature enabled, some of the

resources are not available for general use. Table 15-7

shows which features are consumed by the background

debugger.

TABLE 15-7:

DEBUGGER RESOURCES

To use the In-Circuit Debugger function of the micro-

controller, the design must implement In-Circuit Serial

Programming connections to MCLR/VPP, VDD, GND,

RB7 and RB6. This will interface to the In-Circuit

Debugger module available from Microchip, or one of

the third party development tool companies.

15.15 Program Verification/Code

Protection

If the code protection bit(s) have not been pro-

grammed, the on-chip program memory can be read

out for verification purposes.

15.16 ID Locations

Four memory locations (2000h - 2003h) are designated

as ID locations, where the user can store checksum or

other code identification numbers. These locations are

not accessible during normal execution, but are read-

able and writable during program/verify. It is recom-

mended that only the four Least Significant bits of the

ID location are used.

15.17 In-Circuit Serial Programming

PIC16F87/88 microcontrollers can be serially pro-

grammed while in the end application circuit. This is

simply done with two lines for clock and data and three

other lines for power, ground, and the programming

voltage (see Figure 15-13 for an example). This allows

customers to manufacture boards with unprogrammed

devices and then program the microcontroller just

before shipping the product. This also allows the most

recent

firmware

custom

firmware

programmed.

For more information on serial programming, please

refer to the PIC16F87/88 Programming Specification

(DS39607).

FIGURE 15-13:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

I/O pins

RB6, RB7

Stack

1 level

Program Memory

Address 0000h must be NOP

Last 100h words

Data Memory

0x070 (0x0F0, 0x170, 0x1F0)

0x1EB-0x1EF

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC16F87/88

VDD

VSS

MCLR/VPP

RB6

RB7

+5V

VPP

CLK

Data I/O

VDD

* Isolation devices (as required).

† RB3 only used in LVP mode.

RB3†

RB3/PGM

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