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2.2 Jumpers Overview
Jumper Name Function Setting
J101-J103
*1
Power selection
Short J101: select external power
Short J102: select JTAG power
Short J103: select USB power
J104
*2
Voltage selection
Short 1,2: 5V
Short 2,3: 3.3V
J-USB-
J-USB+
USB Host/Function
selection
Short 1,2: USB Function
Short 2,3: USB Host
J105 Mode setting
Short: Programming mode
Open: Normal mode
J106 Oscillator Selection
Short 1,2: when 4M oscillator is used
Short 2,3: when 48M oscillator is used
J107 P22 connection
Short: connect P22 (UART_TX0) with MAX3232
Open: disconnect P22 (UART_TX0) with MAX3232
J701 Voltage division
Short: when 5V power is used
Open: when 3.3V power is used
Table 2-1: Jumper List
Attention:
1) Never short J101-103 at the same time! When Keil U-Link ME is used, JTAG power
can not be used.
2) When Keil U-link is used, only 3.3V can be selected, never select 5V power!
2.3 Setting for UART On-Board Programming
Part Number Function Setting
UART-0
DB9 connector Connect with PC via RS232 cable
J106 Oscillator Selection Open
J105 Mode setting short
J107
P22 connection short
Table 2-2: Setting for UART On-Board Programming
2.4 Setting for USB On-Board Programming
Part Number Function Setting
USBFUNCTION
USB function connector Connect with PC via USB cable
J-USB-
J-USB+
Function/Host selection Short 1,2
J105 Mode setting Short
J106 Oscillator Selection Short 1,2
J107 P22 connection Open
J701 Voltage division
Short: when 5V power is used
Open: when 3.3V power is used
Table 2-3: Setting for USB On-Board Programming
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