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TWR-K70F120M Tower Module User's Manual
Page 16 of 25
bus can access devices on Tower peripheral modules. Refer to Table 7 “TWR-K70F120M Primary
Connector Pinout” and sheet 8 of the TWR-K70F120M schematics for more details.
3
Jumper Table
There are several jumpers on the TWR-K70F120M that provide configuration selection and signal
isolation. Refer to the following table for details. The default installed jumper settings are shown in
bold with asterisks.
Table 5.
TWR-K70F120M Jumper Table
Jumper
Option
Setting
Description
J1
USB VREGIN Power
Connection
*ON*
Connect USB0_VBUS from Primary Elevator (A57) to
VREGIN
OFF
Disconnect VREGIN from Primary Elevator
J2
Infrared Transmitter
Connection
ON
Connect PTD7/CMT_IRO/UART0_TX to IR Transmitter (D1)
*OFF*
Disconnect PTD7/CMT_IRO/UART0_TX from IR Transmitter
(D1)
J8
MCU Power Connection
*ON*
Connect on-board 3.3V supply to MCU
OFF
Isolate MCU from power supply (allows for external supply
or power measurements)
J10
OSJTAG Mode Selection
ON
OSJTAG bootloader mode (OSJTAG firmware
reprogramming)
*OFF*
Debugger mode
J12
JTAG Power Connection
ON
Connect on-board 5V supply to JTAG port (supports
powering board from external JTAG probe)
*OFF*
Disconnect on-board 5V supply from JTAG port
J16
Infrared Receiver
Connection
ON
Connect DAC1_OUT/CMP2_IN3 to IR Receiver
*OFF*
Disconnect DAC1_OUT/CMP2_IN3 to IR Receiver
J17
VBAT Power Selection
*1-2*
Connect VBAT to on-board 3.3V supply
2-3
Connect VBAT to the higher voltage between on-board 3.3V
supply or coin-cell supply
J18
(revC
board)
50 MHz oscillator output
enable
ON
On-board 50MHz oscillator disabled. Off-board clock drives
main EXTAL.
NOTE: This option should be selected whenever a tower
module card that provides a clock on primary elevator pin
B24 is connected to the CPU module. Otherwise there will be
contention between the two clock sources.
*OFF*
On-board 50MHz oscillator enabled. On-board 50 MHz clock
drives main EXTAL.