AN-175
5
Holt Integrated Circuits
Demonstration Set-up
MC9S12XD
16 Bit MCU
HOLT
HI-3110 CAN
Controller
SPI (4)
GP1,GP2,STAT,INT
RS-232 Console
USB Debug Port
DB9
CAN Bus
Connector
LEDs (10)
User Push
Button
Switches (4)
Dip SWs
(4)
Dip SWs (6)
Expansion
Headers
(2x14) x 2
RESET Button
CAN
Transceiver
The board requires a +5V (0.5A) power supply applied to TP1 and Gnd to TP6. There are two ways to
connect the CANL and CANH signals to the CAN Bus. The CANL and CANH Bus signals are available on
the two test points on the top right side of the board or from the DB9 connector.
Power On Reset
For normal operation ensure SW2 – 4 (MRST) is in the open position otherwise the MCU will be held in
the reset state. The purpose of this MRST dip switch is to allow easy interfacing of an external MCU to
the HI-3110 such that the SPI signals from the Freescale MCU will be forced into high impedance so as
not to conflict with an external MCU. For normal operation keep this switch open and use the RESET
button to reset the MCU during testing.
For Modes 1-6 the MCU will initialize the HI-3110 and check the STATF status register for the default
0x82 value, if the status value does not match 0x82 the program will turn on the Red LED8 and halt.
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