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ST92E141 데이터시트(PDF) 11 Page - STMicroelectronics |
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11 / 179 page 11/179 ST92141 - GENERAL DESCRIPTION 1.2.1 I/O Port Configuration All ports can be individually configured as input, bi- directional, output, or alternate function. Refer to the Port Bit Configuration Table in the I/O Port Chapter. All I/Os are implemented with a High Hysteresis or Standard Hysteresis Schmitt trigger function (See Electrical Characteristics). Weak Pull-Up = This column indicates if a weak pull-up is present or not (refer to Table 3). – If WPU = yes, then the WPU can be enabled/dis- able by software – If WPU = no, then enabling the WPU by software has no effect All port output configurations can be software se- lected on a bit basis to provide push-pull or open drain driving capabilities. For all ports, when con- figured as open-drain, the voltage on the pin must never exceed the VDD power line value (refer to Electrical characteristics section). 1.2.2 I/O Port Reset State I/Os are reset asynchronously as soon as the RE- SET pin is asserted low. All I/Os are forced by the Reset in "floating input" configuration mode. WARNING When a common pin is declared to be connected to an alternate function input and to an alternate function output, the user must be aware of the fact that the alternate function output signal always in- puts to the alternate function module declared as input. When any given pin is declared to be connected to a digital alternate function input, the user must be aware of the fact that the alternate function input is always connected to the pin. When a given pin is declared to be connected to an analog alternate function input (ADC input for example) and if this pin is programmed in the "AF-OD" mode, the digit- al input path is disconnected from the pin to pre- vent any DC consumption. Table 3. I/O Port Characteristics Legend: OD = Open Drain; HC= High current Input Output Weak Pull-Up Reset State Port 3[4:0] Port 3[6:5] Schmitt trigger (High Hysteresis) Schmitt trigger (High Hysteresis) Push-Pull/OD Push-Pull/OD (HC) Yes Yes Floating input Floating input Port 5.0 Port 5.1 Port 5.2 Port 5[7:3] Schmitt trigger (High Hysteresis) Schmitt trigger (High Hysteresis) Schmitt trigger (Standard Hysteresis) Schmitt trigger (Standard Hysteresis) Push-Pull/OD (HC) Push-Pull/OD Push-Pull/OD (HC) Push-Pull/OD Yes Yes Yes Yes Floating input Floating input Floating input Floating input 9 |
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