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CY8CKIT-059 数据表(PDF) 38 Page - Infineon Technologies AG |
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CY8CKIT-059 数据表(HTML) 38 Page - Infineon Technologies AG |
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38 / 140 page  Document Number: 001-84932 Rev. *N Page 37 of 139 PSoC® 5LP: CY8C58LP Family Datasheet The USBIO pins (P15[7] and P15[6]), when enabled for I/O mode, have limited drive mode control. The drive mode is set using the PRT15.DM0[7, 6] register. A resistive pull option is also available at the USBIO pins, which can be enabled using the PRT15.DM1[7, 6] register. When enabled for USB mode, the drive mode control has no impact on the configuration of the USB pins. Unlike the GPIO and SIO configurations, the port wide configuration registers do not configure the USB drive mode bits. Table 6-7 shows the drive mode configuration for the USBIO pins. High impedance analog The default reset state with both the output driver and digital input buffer turned off. This prevents any current from flowing in the I/O’s digital input buffer due to a floating voltage. This state is recommended for pins that are floating or that support an analog voltage. High impedance analog pins do not provide digital input functionality. To achieve the lowest chip current in sleep modes, all I/Os must either be configured to the high impedance analog mode, or have their pins driven to a power supply rail by the PSoC device or by external circuitry. High impedance digital The input buffer is enabled for digital signal input. This is the standard high impedance (HiZ) state recommended for digital inputs. Resistive pull-up or resistive pull-down Resistive pull-up or pull-down, respectively, provides a series resistance in one of the data states and strong drive in the other. Pins can be used for digital input and output in these modes. Interfacing to mechanical switches is a common application for these modes. Resistive pull-up and pull-down are not available with SIO in regulated output mode. Open drain, drives high and open drain, drives low Open drain modes provide high impedance in one of the data states and strong drive in the other. Pins can be used for digital input and output in these modes. A common application for these modes is driving the I2C bus signal lines. Strong drive Provides a strong CMOS output drive in either high or low state. This is the standard output mode for pins. Strong Drive mode pins must not be used as inputs under normal circumstances. This mode is often used to drive digital output signals or external FETs. Resistive pull-up and pull-down Similar to the resistive pull-up and resistive pull-down modes except the pin is always in series with a resistor. The high data state is pull-up while the low data state is pull-down. This mode is most often used when other signals that may cause shorts can drive the bus. Resistive pull-up and pull-down are not available with SIO in regulated output mode. 6.4.2 Pin Registers Registers to configure and interact with pins come in two forms that may be used interchangeably. All I/O registers are available in the standard port form, where each bit of the register corresponds to one of the port pins. This register form is efficient for quickly reconfiguring multiple port pins at the same time. I/O registers are also available in pin form, which combines the eight most commonly used port register bits into a single register for each pin. This enables very fast configuration changes to individual pins with a single register write. 6.4.3 Bidirectional Mode High speed bidirectional capability allows pins to provide both the high impedance digital drive mode for input signals and a second user selected drive mode such as strong drive (set using PRTxDM[2:0] registers) for output signals on the same pin, based on the state of an auxiliary control bus signal. The bidirectional capability is useful for processor busses and communications interfaces such as the SPI Slave MISO pin that requires dynamic hardware control of the output buffer. The auxiliary control bus routes up to 16 UDB or digital peripheral generated output enable signals to one or more pins. 6.4.4 Slew Rate Limited Mode GPIO and SIO pins have fast and slow output slew rate options for strong and open drain drive modes, not resistive drive modes. Because it results in reduced EMI, the slow edge rate option is recommended for signals that are not speed critical, generally less than 1 MHz. The fast slew rate is for signals between 1 MHz and 33 MHz. The slew rate is individually configurable for each pin, and is set by the PRTxSLW registers. Table 6-7. USBIO Drive Modes (P15[7] and P15[6]) PRT15.DM1[7,6] Pull up enable PRT15.DM0[7,6] Drive Mode enable PRT15.DR[7,6] = 1 PRT15.DR[7,6] = 0 Description 0 0 High Z Strong Low Open Drain, Strong Low 0 1 Strong High Strong Low Strong Outputs 1 0 Res High (5k) Strong Low Resistive Pull Up, Strong Low 1 1 Strong High Strong Low Strong Outputs |
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