PIC16F616-ESLASHML datasheet(116/172 Pages) APEX

116 / 172 page

PIC16F616/16HV616

DS41288A-page 114

Preliminary

11.10 In-Circuit Serial Programming™

The PIC16F616/16HV616 microcontrollers can be

serially programmed while in the end application circuit.

This is simply done with five connections for:

•clock

•data

• power

• ground

• programming voltage

This allows customers to manufacture boards with

unprogrammed devices and then program the micro-

controller just before shipping the product. This also

allows the most recent firmware or a custom firmware

to be programmed.

The device is placed into a Program/Verify mode by

holding the RA0 and RA1 pins low, while raising the

MCLR (VPP) pin from VIL to VIHH. See the “PIC12F6XX/

16F6XX

Memory

Programming

Specification”

(DS41204) for more information. RA0 becomes the

programming data and RA1 becomes the programming

clock. Both RA0 and RA1 are Schmitt Trigger inputs in

Program/Verify mode.

A typical In-Circuit Serial Programming connection is

shown in Figure 11-10.

FIGURE 11-10:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

11.11 In-Circuit Debugger

Since in-circuit debugging requires access to three

pins, MPLAB® ICD 2 development with an 14-pin

device is not practical. A special 20-pin PIC16F616/

16HV616 ICD device is used with MPLAB ICD 2 to pro-

vide 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 PIC16F616/16HV616 device. The

debugging adapter is the only source of the ICD device.

When the ICD pin on the PIC16F616/16HV616 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 11-9

shows

which

features

are

consumed

the

background debugger.

TABLE 11-9:

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 11-11:

20-PIN ICD PINOUT

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC16F616/16HV616

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

SHUNTEN

ICDMCLR/VPP

VDD

RA5

RA4

RA3

ICDCLK

ICDDATA

Vss

RA0

ICD

RA1

RA2

RC5

RC4

RC3

RC0

RC1

RC2

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