PIC16F7X7 datasheet(194/276 Pages) MICROCHIP

194 / 276 page

PIC16F7X7

DS30498C-page 192

 2004 Microchip Technology Inc.

15.19 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

functions when used with MPLAB® ICD. When the

microcontroller 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.

15.20 Program Verification/Code

Protection

the

code

protection

bit(s)

have

not

been

programmed, the on-chip program memory can be

read out for verification purposes.

15.21 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

readable and writable during program/verify. It is

recommended that only the four Least Significant bits

of the ID location are used.

15.22 In-Circuit Serial Programming

PIC16F7X7

microcontrollers

can

serially

programmed 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 15-17 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 general information of serial programming, please

refer to the “In-Circuit Serial Programming™ (ICSP™)

Guide” (DS30277).

FIGURE 15-17:

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)

0x165-0x16F

Note:

In-Circuit Debugger operation must occur

between the operating voltage range

(VDD) of 4.75V-5.25V on PIC16F7X7

devices.

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC16F7X7

VDD

VSS

MCLR/VPP/RE3

RB6

RB7

+5V

VPP

CLK

Data I/O

VDD

* Isolation devices (as required).

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