TWR-56F8400 User’s Manual
Page 19 of 35
Jumper
Function
Shunts
Description
J9
TXD Source Select (note that
only one connection can be
made to pin 3 at a time)
1-2
Connect ELEV_TXD0 from the Tower connector
to MC56F84789 DSC pin
GPIO
C2
/TXD0/TB0/XB_IN2/CLKO0
2-3
Connect TXD_SEL from the USB Serial Bridge to
MC56F84789 DSC pin
GPIO
C2
/TXD0/TB0/XB_IN2/CLKO0
Pin 2
open
Disconnect MC56F84789 DSC pin
GPIO
C2
/TXD0/TB0/XB_IN2/CLKO0
3-4
Connect TXD_SEL from the USB Serial Bridge to
MC56F84789 DSC pin GPIO
F4
/TXD1/XB_OUT8
4-5
Connect ELEV_TXD1 from the Tower connector
to MC56F84789 DSC pin GPIO
F4
/TXD1/XB_OUT8
Pin 4
open
Disconnect MC56F84789 DSC pin
GPIO
F4
/TXD1/XB_OUT8
J10 and
J11
5V Source Select
J10-1 to
J11-2
Connect the power in barrel connector (through fuse
F1) to the input of the 3.3V voltage regulator
J11-1 to
J11-2
Connect P5V_TRG_USB (the switched USB 5V) to
the input of the 3.3V voltage regulator
J11-2 to
J11-3
Connect P5V_ELEV to the input of the 3.3V voltage
regulator
J11-2
open
Disconnect the input of the 3.3V voltage regulator
J12
Unused
open
Unused
J15
CAN Termination Enable
1-2
Connect the 120 ohm CAN termination resistor
open
No CAN termination
J16
CAN Enable
1-2, 3-4
Connect the CAN transceiver TXD and RXD to
MC56F84789 DSC pins
GPIOC11/CANTX/SCL1/TXD1
GPIOC12/CANRX/SDA1/RXD1
open
Disconnect the CAN transceiver
J17
MC9S08JM60 Bootload Enable
1-2
Enable USB bootloading of the MCU Flash memory
open
Disable bootloading
J19
Thermistor RT3 Connect
1-2, 3-4
Connect RT3 circuit to the MC56F827 DSC
none
Disconnect RT3 circuit from the MC56F84789 DSC
J20
RESERVEC /
OSBDM/OSJTAG Enable
1-2
Reserved-deprecated
none
Reserved-deprecated
J21
OSBDM/OSJTAG Connect to
JTAG
1-2, 3-4,
5-6, 7-8
Connect the OSBDM/OSJTAG debug signals
(JTAG) to the MC56F84789 DSC JTAG pins
none
Disconnect OSBDM/OSJTAG from the MC56F84789
DSC
J23
Thermistor RT4 Connect
1-2, 3-4
Connect RT4 circuit to the MC56F827 DSC
none
Disconnect RT4 circuit from the MC56F84789 DSC
