DS51292L-page 4

© 2005 Microchip Technology Inc.

18-PIN HEADERS

For these headers, there are no jumpers/switches. The device with the most program

memory is always selected.

If PIC16F627A or PIC16F628A devices are selected for MPLAB ICD 2 development in

MPLAB IDE, the warning “ICDWarn0020: Invalid target device id” may be received in

the build window and as a dialog. The reason is the PIC16F648A-ICD device supports

PIC16F648A, PIC16F627A and PIC16F628A, but only reports the device ID for the

PIC16F648A.

Ignore this warning or disable it under the Warnings tab on the ICD Programming

dialog.

20-PIN HEADER – PIC16F639

For the PIC16F639 20-pin header, you will need to connect the jumper J3 as specified

below.

In addition to being used with MPLAB ICD 2, this header is used with the PCM16YM0

processor module to emulate a PIC16F639 on the MPLAB ICE 2000 in-circuit emulator.

Plug the end of the processor module into the header, and then plug the header into

the transition socket or directly onto the target board.

20-PIN HEADER – PIC16F785

For the PIC16F785 20-pin header, you will need to connect the jumper J2 to enable the

shunt regulator.

20-PIN HEADER – PIC16F690

For the PIC16F690 20-pin header, you will need to set the S1 switches (Figure 2) to

enable peripherals and choose devices (Table 3).

FIGURE 2:

S1 SWITCH HARDWARE

Tool

Jumper Setting

Function

1-2

Run/program as regular device

MPLAB ICD 2

2-3

Run/program as ICD device

Device

Jumper Setting

Function

PIC16F785

1-2

Disable shunt regulator

PIC16HV785

2-3

Enable shunt regulator

ADC

4kPFM

ECCP

SSP

USART

Switch configuration at left shows all

peripherals enabled, which is the setting to

select the PIC16F690 device.

ENABLE

ON