12F615 datasheet(112/168 Pages) MICROCHIP

112 / 168 page

PIC12F609/615/12HV609/615

DS41302A-page 110

Preliminary

11.10 In-Circuit Serial Programming™

The

PIC12F609/615/12HV609/615 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 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 GP0 and GP1 pins low, while raising the

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

16F6XX

Memory

Programming

Specification”

(DS41204) for more 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 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.

special

28-pin

PIC12F609/615/

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 PIC12F609/615/12HV609/615

device. The debugging adapter is the only source of the

ICD device.

When the ICD pin on the PIC12F609/615/12HV609/

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 11-10 shows which features are consumed

by the background debugger.

TABLE 11-10: 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).

Note:

To erase the device VDD must be above

the Bulk Erase VDD minimum given in the

“PIC12F609/615/12HV609/615

Memory

Programming Specification” (DS41284)

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC12F615/12HV615

VDD

VSS

MCLR/VPP/GP3

GP1

GP0

+5V

VPP

CLK

Data I/O

* Isolation devices (as required)

PIC12F609/12HV609

Resource

Description

I/O pins

ICDCLK, ICDDATA

Stack

1 level

Program Memory

Address 0h must be NOP

700h-7FFh

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