DLPS117B July 2018 – October 2020 DLPC6421
The DLPC6421 controller provides 83 software-programmable, general-purpose I/O pins. Each GPIO pin is individually configurable as either input or output. In addition, each GPIO output can be either configured as push-pull or open-drain. Some GPIO have one or more alternate-use modes, which are also software configurable. The reset default for all GPIO is as an input signal. However, any alternate function connected to these GPIO pins, with the exception of general purpose clocks and PWM generation, will be reset. When configured as open-drain, the outputs must be externally pulled-up (to the 3.3-V supply). External pull-up or pull-down resistors may be required to ensure stable operation before software is able to configure these ports.