12F617 datasheet(125/212 Pages) MICROCHIP

125 / 212 page

 2010 Microchip Technology Inc.

DS41302D-page 125

PIC12F609/615/617/12HV609/615

12.10 In-Circuit Serial Programming™

ThePIC12F609/615/617/12HV609/615

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

microcontroller 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 GP0 and GP1 pins low, while raising the

MCLR (VPP) pin from VIL to VIHH. See the Memory

Programming

Specification

(DS41284)

for

information. GP0 becomes the programming data and

GP1 becomes the programming clock. Both GP0 and

GP1 are Schmitt Trigger inputs in Program/Verify

mode.

A typical In-Circuit Serial Programming connection is

shown in Figure 12-10.

FIGURE 12-10:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

12.11 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 28-pin PIC12F609/615/617/

12HV609/615 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 PIC12F609/615/617/12HV609/

615 device. The debugging adapter is the only source

of the ICD device.

When the ICD pin on the PIC12F609/615/617/

12HV609/615 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 12-10 shows which features are

consumed by the background debugger.

TABLE 12-10: 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 12-11:

28 PIN ICD PINOUT

Note:

To erase the device VDD must be above

the Bulk Erase VDD minimum given in the

Memory

Programming

Specification

(DS41284)

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC12F615/12HV615

VDD

VSS

MCLR/VPP/GP3/RA3

GP1

GP0

+5V

VPP

CLK

Data I/O

* Isolation devices (as required)

PIC12F609/12HV609

PIC12F617/

Resource

Description

I/O pins

ICDCLK, ICDDATA

Stack

1 level

Program Memory

Address 0h must be NOP

700h-7FFh

28-Pin PDIP

In-Circuit Debug Device

VDD

CS0

CS1

CS2

RA5

RA4

GND

RA0

RA1

SHUNTEN

RC3

RA2

RC0

RA3

RC5

RC4

RC1

RC2

ICDDATA

ICD

ICDCLK

ICDMCLR

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