2.2 Jumpers Overview
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| Jumper Name |
| Function |
| Setting |
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| Power selection |
| Short J101: select external power | |
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| Short J102: select JTAG power | ||
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| Short J103: select USB power |
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| J104*2 |
| Voltage selection |
| Short 1,2: 5V |
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| Short 2,3: 3.3V |
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| USB Host/Function | Short 1,2: USB Function | ||
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| selection | Short 2,3: USB Host | ||
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| J105 | Mode setting | Short: Programming mode | ||
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| Open: Normal mode | ||||
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| J106 |
| Oscillator Selection |
| Short 1,2: when 4M oscillator is used |
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| Short 2,3: when 48M oscillator is used | ||
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| J107 | P22 connection | Short: connect P22 (UART_TX0) with MAX3232 | ||
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| Open: disconnect P22 (UART_TX0) with MAX3232 | ||||
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| J701 | Voltage division | Short: when 5V power is used | ||
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| Open: when 3.3V power is used | ||||
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Attention: |
| Table | ||||
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1)Never short
2)When Keil
2.3 Setting for UART On-Board Programming
| Part Number |
| Function | Setting |
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| DB9 connector | Connect with PC via RS232 cable |
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| J106 | Oscillator Selection | Open |
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| J105 | Mode setting | short |
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| J107 |
| P22 connection | short |
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| Table |
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2.4 Setting for USB |
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| Part Number |
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| Function |
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| Setting |
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| USBFUNCTION |
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| USB function connector |
| Connect with PC via USB cable |
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| Function/Host selection |
| Short 1,2 |
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| J105 |
| Mode setting |
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| Short |
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| J106 |
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| Oscillator Selection |
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| Short 1,2 |
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| J107 |
| P22 connection |
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| Open |
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| J701 |
| Voltage division |
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| Short: when 5V power is used |
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| Open: when 3.3V power is used |
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| Table |
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8