CMD-12DP512 AXIOM, CMD-12DP512 Datasheet - Page 10

• Manufacturer Part Number: CMD-12DP512
• Description: Single Board Computer
• Manufacturer: AXIOM

Specifications of CMD-12DP512

• Silicon Manufacturer: Freescale
• Core Architecture: HCS12
• Core Sub-architecture: S12D
• Features: Onboard Back Ground Debug, Breadboard And Prototype Area
• Kit Contents: Board
• Silicon Family Name: S12D
• Silicon Core Number: MC9S12DP512

C M D - 1 2 D P 5 1 2
TB1 Power Term Block
TB1 provides access to the +VIN, GND (power ground), and +5V logic power supplies. +VIN
input power should only be applied by J1 or TB1, not both or a supply conflict may occur. The
+5V logic supply may be accessed at TB1 for user circuit application with in the current limits
of VR1. TB1 +5V connection may also source the +5V logic supply when the POWER option
is open or idle. The +5V source must be regulated and with in the 4.9V to 5.1V range.
PWR_SEL Option
The PWR_SEL option enables the enables the +5VDC from the CMD-12DP512 on board VR1
voltage regulator or USB BDM +5V to the board circuits. If the user requires applying external
+5VDC by TB1 connection to the CMD-12DP512 board, the PWR_SEL option must be opened
or idled. Applying external +5VDC is not recommended and may damage the CMD-12DP512
board if not properly regulated. User may apply a separate +5VDC for user circuit application
and apply the GND / Common connection instead. If a separate +5V supply is applied, caution
should be applied not to connect the on board +5V to the external +5V supply.
The USB power option position is limited to 200ma total. The USB power option should not be
applied if external circuits are applied on the CMD-12DP512 board.
RESET
The HCS12 Reset has several sources and is indicated active by the RESET indicator. The
Reset indicator will be ON for the duration of Reset signal being active. If the Reset indicator is
ON constantly there is an issue that is preventing the HCS12 from executing or causing the
Reset signal to be applied active (logic low or 0 volts). When RESET is active no HCS12
operation is possible.
On-board Reset is provided by the USB BDM port (BDM_ON options are installed), BDM Port
(development cable connected), RESET switch (depressed), LV1 voltage detector (+5V too
low condition), HCS12 (oscillator or COP watchdog), and the BUS Port (Reset signal). User
should review the possible cause and clear the issue to operate the CMD-12DP512 board.
USB
EXT
USB +5V
input
R E V
TB1
B .
+5VDC
GROUND or common (-)
+VIN
USB
EXT
TB1 +VIN
J1 Power
Jack or
input
10
USB
EXT
+5V in from
Connectors
TB1 +5V
input or
I/O
0 8 / 2 3 / 0 7