AC244026, AC244027

Last modified by Microchip on 2023/12/22 13:19

Header Identification

The AC number is used for ordering the Processor Extension Pak (PEP) that contains the debug header. However, this number is not on the header as the board may be used for multiple headers by inserting different -ICE/-ICD devices. To identify these headers, use the following information.

AC Number-ICE/-ICD DeviceBoard Assembly Number

Header Setup and Operation

This PEP provides extra debugging capability not available on the production devices:

  • Three addresses or data breakpoints (one address-only breakpoint on production devices).
  • Data capture (real-time data streaming).
  • No user Flash resources are needed for debugging.
  • No user RAM resources are needed for debugging.
  • No user pins are required.

This header has jumpers available for MCLR pull-up and power LED control:

J2OpenDisable weak ICE MCLR pull-up resistor.
ShortEnable weak ICE MCLR pull-up resistor.
This option keeps the target program running even after the tool
has been disconnected from the header, i.e., the pin will not
float high.
J3OpenDisable power LED indicator. This option saves power.
ShortEnable power LED indicator.

AC244026 Header

Additionally, this header has jumpers related to the Low Dropout (LDO) voltage regulator. Depending on the device pin used for this function, you would use either J4 (RA0), J5 (RA5), or J6 (RA6) for Vcap selection. For details on the voltage regulator, see the PIC16F72X/PIC16LF72X datasheet (DS41341).

J4, J5
or J6
OpenUse only target capacitance for Vcap.
This is the standard configuration.
ShortUse both on-board and target capacitance for Vcap.
This option is to provide an extra margin for the voltage regulator
stability/regulation in cases where there is a long lead length
between the emulation header Vcap pin and the target Vcap pin.
(As examples, when using long-pin Dual Inline Packages (DIP) transition sockets or
certain Quad Flat No Leads (QFN) transition sockets.)

Test points are available on this header to check the following:

Test PointSignalTest PointSignalPinJumper
TP3ICD EnableTP8VcapRA6J6

AC244027 Header

This header has jumpers available for MCLR pull-up and power LED control.

Test PointSignal
TP3ICD Enable

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Header Limitations

Sometimes a header device (-ICE/-ICD) has operational issues or errata. To determine if a device on a header has limitations, see your hardware tool documentation.

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Header Dimensions

The accompanying figure lists the dimensions for the debug header. Dimensions are design values in inches.

If the length and/or width of the debug header is too large of a footprint for the target board, consider using stand-offs, transition sockets, or other extenders in the header connection socket to raise the header above the target.

AC244026, AC244027 dimensions

Figure: Dimensions - AC244026, AC244027

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