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| www.ezurio.com |
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UART_RTS | 23 | O | VOLmax=0.2V |
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| VOHmin=2.8V |
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UART_DSR | 10 | I | VILmax=0.8V |
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| VIHmin=2.1V |
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| VIHmax=3.7V |
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UART_DTR | 12 | O | VOLmax=0.2V | Shared with GPIO3 |
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| VOHmin=2.8V |
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UART_RI | 6 | I or O | O/P : VOLmax=0.2V | Direction may be programmed. |
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| VOHmin=2.8V |
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| I/P : VILmax=0.8V |
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| VIHmin=2.1V |
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| VIHmax=3.7V |
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UART_DCD | 8 | I or O | O/P : VOLmax=0.2V | Direction may be programmed. |
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| VOHmin=2.8V |
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| I/P : VILmax=0.8V |
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| VIHmin=2.1V |
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| VIHmax=3.7V |
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3.3.2.3SPI Bus
Signal Name | Pin No | I/O | Signal level | Comments |
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SPI_MOSI | 17 | I | VILmax=0.8V | Used to reprogram Flash |
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| VIHmin=2.1V |
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| VIHmax=3.7V |
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SPI_MISO | 5 | O | VOLmax=0.2V |
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| VOHmin=2.8V |
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SPI_CSB | 7 | I | VILmax=0.8V |
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| VIHmin=2.1V |
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| VIHmax=3.7V |
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SPI_CLK | 9 | I | VILmax=0.8V |
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| VIHmin=2.1V |
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| VIHmax=3.7V |
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