PIC16F688T-I/ST データシートの表示（PDF） - Microchip Technology

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PIC16F688T-I/ST

14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

11.9 In-Circuit Serial Programming

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 11-11.

FIGURE 11-11:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

External

Connector

Signals

+5V

0V

VPP

CLK

Data I/O

To Normal

Connections

*

PIC16F688

VDD

VSS

MCLR/VPP/RA3

RA1

RA0

***

To Normal

Connections

* Isolation devices (as required)

PIC16F688

11.10 In-Circuit Debugger

Since in-circuit debugging requires access to the data

and MCLR pins, MPLAB® ICD 2 development with an

14-pin device is not practical. A special 20-pin

PIC16F688 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 PIC16F688 device. The

debugging adapter is the only source of the ICD device.

When the ICD pin on the PIC16F688 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 by the background debugger:

TABLE 11-9: DEBUGGER RESOURCES

Resource

Description

I/O pins

Stack

Program Memory

ICDCLK, ICDDATA

1 level

Address 0h must be NOP

700h-7FFh

For more information, see “MPLAB® ICD 2 In-Circuit

Debugger User’s Guide” (DS51331), available on

Microchip’s web site (www.microchip.com).

FIGURE 11-12: 20-PIN ICD PINOUT

20-Pin PDIP

In-Circuit Debug Device

NC

ICDMCLR/VPP

VDD

RA5

RA4

RA3

RC5

RC4

RC3

ICD

1 20

2 19

3 18

4 17

5 16

6 15

7 14

8 13

9 12

10 11

ICDCLK

ICDDATA

Vss

RA0

RA1

RA2

RC0

RC1

RC2

NC

© 2007 Microchip Technology Inc.

DS41203D-page 127

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