BDM_PORT HEADER
A 6-pin BDM port header allows connection of a HC(S)12 compatible BDM cable for
application development. Refer to the BDM cable documentation for details on use of the
BDM cable with this module.
Figure 1: BDM_PORT
MODC/BKGD
1
2
GND
3
4
RESET*
5
6
VDD
See the HC12 Reference Manual for
complete DEBUG documentation
EXPANDED MODE OPERATION
For the APS12DT256SLK module, expanded mode operation is supported and available to the
user. All signals necessary to implement the multiplexed bus are available at connector J1.
The MODE option header is used to configure the module for expanded bus mode operation.
Refer to the 9S12DT256 Device User Guide for details on implementing the expanded bus.
MODE
By default, the MC9S12DT256 MCU’s are configured for single-chip operation. The MODE
option header allows the user to configure the board for expanded bus operation. In default
configuration, this header is not installed in default configurations.
Figure 2: MODE Option Header
MODB 3 4
Shunt pulls MODB input high
MODA 1
2
Shunt pulls MODA input high
MODE
NOTE: Expanded bus mode operation is supported only when a 9S12DT256 MCU is installed
on the MCU.
POWER
The APS12DT256SLK is designed to be used with and powered from the PBMCUSLK. The
APS12DT256SLK will source power from the PBMCUSLK through connector J1. The module
may also be used as a stand-alone platform. As a stand-alone platform, the module may be
powered through the 2.1mm barrel connector and on-board regulator or through connector J1.
The module may also be configured to provide power to external circuitry connected to J1.
When powering external circuitry, do not exceed the maximum output current limit of the on-
board regulator.
10 Freescale Semiconductor
