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CY8CKIT-059 数据表(PDF) 37 Page - Infineon Technologies AG |
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CY8CKIT-059 数据表(HTML) 37 Page - Infineon Technologies AG |
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37 / 140 page  Document Number: 001-84932 Rev. *N Page 36 of 139 PSoC® 5LP: CY8C58LP Family Datasheet 6.4.1 Drive Modes Each GPIO and SIO pin is individually configurable into one of the eight drive modes listed in Table 6-6. Three configuration bits are used for each pin (DM[2:0]) and set in the PRTxDM[2:0] registers. Figure 6-11 depicts a simplified pin view based on each of the eight drive modes. Table 6-6 shows the I/O pin’s drive state based on the port data register value or digital array signal if bypass mode is selected. Note that the actual I/O pin voltage is determined by a combination of the selected drive mode and the load at the pin. For example, if a GPIO pin is configured for resistive pull-up mode and driven high while the pin is floating, the voltage measured at the pin is a high logic state. If the same GPIO pin is externally tied to ground then the voltage unmeasured at the pin is a low logic state. Figure 6-11. Drive Mode Table 6-6. Drive Modes Diagram Drive Mode PRTxDM2 PRTxDM1 PRTxDM0 PRTxDR = 1 PRTxDR = 0 0 High-impedance analog 0 0 0 High-Z High-Z 1 High-impedance digital 0 0 1 High-Z High-Z 2 Resistive pull-up[10] 0 1 0 Res High (5K) Strong Low 3 Resistive pull-down[10] 0 1 1 Strong High Res Low (5K) 4 Open drain, drives low 1 0 0 High-Z Strong Low 5 Open drain, drive high 1 0 1 Strong High High-Z 6 Strong drive 1 1 0 Strong High Strong Low 7 Resistive pull-up and pull-down[10] 1 1 1 Res High (5K) Res Low (5K) Out In Pin Out In Pin Out In Pin Out In Pin Out In Pin Out In Pin Out In Pin Out In Pin 0. High Impedance Analog 1. High Impedance Digital 2. Resistive Pull-Up 3. Resistive Pull-Down 4. Open Drain, Drives Low 5. Open Drain, Drives High 6. Strong Drive 7. Resistive Pull-Up and Pull-Down VDD VDD VDD VDD VDD An An An An An An An An The Outﺶconnection is driven from either the Digital System (when the Digital Output terminal is connected) or the Data Register (when HW connection is disabled). The Inﺶconnection drives the Pin State register, and the Digital System if the Digital Input terminal is enabled and connected. The Anﺶconnection connects to the Analog System. Note 10. Resistive pull-up and pull-down are not available with SIO in regulated output mode. |
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