Freescale Semiconductor Demonstration Board for Freescale MC9S12XHY256 Microcontroller DEMO9S12XHY256 DEMO9S12XHY256 Manuale Utente
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Codici prodotto
DEMO9S12XHY256
D E M O 9 S 1 2 X H Y 2 5 6
J U L Y 1 5 , 2 0 1 0
U S E R G U I D E
7
DEVELOPMENT SUPPORT
Application development and debug for the target MC9S12XHY256 is supported through the
background debug mode (BDM) interface. The BDM interface consists of an integrated USB-
Multilink BDM and a 6-pin interface header (BDM_PORT). The BDM_PORT header allows
connecting an external HCS12 BDM cable. Refer to the MC9S12XHY Reference Manual for
details and capabilities of the BDM.
background debug mode (BDM) interface. The BDM interface consists of an integrated USB-
Multilink BDM and a 6-pin interface header (BDM_PORT). The BDM_PORT header allows
connecting an external HCS12 BDM cable. Refer to the MC9S12XHY Reference Manual for
details and capabilities of the BDM.
Integrated BDM
The DEMO9S12XHY256 board features an integrated USB-BDM. The integrated BDM
supports application development and debug via background debug mode. All necessary
signals are provided by the integrated BDM. A USB, type B, connector provides connection
from the target board to a host PC.
supports application development and debug via background debug mode. All necessary
signals are provided by the integrated BDM. A USB, type B, connector provides connection
from the target board to a host PC.
The integrated USB-Multilink BDM provides power and ground to the target board eliminating
the need for external power. Power from the USB-Multilink BDM is derived from the USB bus;
therefore, total current consumption for the target board, and connected circuitry, must not
exceed 500mA. This current limit describes the current supplied by the USB cable to the
BDM circuit, the target board, and any connected circuitry. Excessive current drain will violate
the USB specification causing the bus to disconnect. Damage to the host PC USB hub or the
target board may result.
the need for external power. Power from the USB-Multilink BDM is derived from the USB bus;
therefore, total current consumption for the target board, and connected circuitry, must not
exceed 500mA. This current limit describes the current supplied by the USB cable to the
BDM circuit, the target board, and any connected circuitry. Excessive current drain will violate
the USB specification causing the bus to disconnect. Damage to the host PC USB hub or the
target board may result.
CAUTION:
When powered from the USB bus, do not exceed the 500mA maximum
allowable current drain. Damage to the target board or host PC may
result
NOTE:
10K ohm pull-ups are applied to BDM signals RESET* and BKGD
inside the P&E BDM block. These pull-ups are not shown on the
schematic.
BDM_PORT Header
An HCS(X)12 compatible BDM cable may be attached to the 6-pin BDM interface header (J2)
if desired. Figure 2 below shows the pin-out for the BDM_PORT header.
if desired. Figure 2 below shows the pin-out for the BDM_PORT header.