CMD-12DP512 AXIOM, CMD-12DP512 Datasheet - Page 15

• 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
KEYPAD / PORT H
The KEYPAD / PORT H connector provides interface for the HCS12 port H or for applying a
keypad such as the Axiom Mfg. HC-KP. When applied as a KEYPAD connector, the interface
is for a passive 4 x 4 matrix (16 key) keypad device. the port is optioned for a 1x8 keypad
connector or a 2x4 keypad connector.
USER I/O Connector
The USER I/O connector provides access to the user LED1 – 4 indicators, SW1 – 4 push
switches, and RV1 potentiometer. User LED inputs are 0 to 5V compliant and the respective
indicator will be ON with logic high or +5V level applied. The SW1 – 4 push switches provide
an active logic low or 0 volts output when depressed. For HCS12 input port application the
detection of the switch active or inactive level may need de-bounce applied in software to
validate the condition.
ohms. The RV1 output level may be input to the HCS12 analog input(s) or to user applications
in the bread board or prototyping areas.
USER I/O
BREADBOARD and Prototype Area
The breadboard provides an easy work space to quickly install leaded parts and connect them
to the HCS12 I/O or board power supply. The side rail component holes are bussed to allow
power supply connections or other multi tap signal applications. The I/O port connectors
provide a standard hole size to apply 22 – 24 gauge solid core wire between the connectors
and breadboard.
PH0
PH1
PH2
PH3
PH4
PH5
PH6
PH7
1
2
3
4
5
6
7
8
1 PH4
2 PH5
3 PH6
4 PH7
1
2
3
4
5
6
7
8
9
R E V
SW1 output
SW2 output
SW3 output
SW4 output
LED1 input
LED2 input
LED3 input
LED4 input
RV1 output
B .
This interface is implemented as a software key scan. Pins PH0-3 are
used as column drivers which are active high outputs. Pins PH4-7 are
used for row input and will read high when their row is high.
See the Keypad example programs for applying this connector.
RV1 provides a 0 to 5V analog output. Total RV1 resistance is 5K
15
0 8 / 2 3 / 0 7