I/O Ports - Texas Instruments CC253x User Manual

There are 21 digital input/output pins that can be configured as general-purpose digital I/O or as peripheral
I/O signals connected to the ADC, timers, or USART peripherals. The use of the I/O ports is fully
configurable from user software through a set of configuration registers.
The I/O ports have the following key features:
• 21 digital input/output pins
• General-purpose I/O or peripheral I/O
• Pullup or pulldown capability on inputs
• External interrupt capability
The external interrupt capability is available on all 21 I/O pins. Thus, external devices may generate
interrupts if required. The external interrupt feature can also be used to wake the device up from sleep
mode (power modes PM1, PM2, and PM3).
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Topic
7.1 Unused I/O Pins
7.2 Low I/O Supply Voltage
7.3 General-Purpose I/O
7.4 General-Purpose I/O Interrupts
7.5 General-Purpose I/O DMA
7.6 Peripheral I/O
7.7 Debug Interface
7.8 32-kHz XOSC Input
7.9 Radio Test Output Signals
7.10 Power-Down Signal MUX (PMUX)
7.11 I/O Registers
78

I/O Ports

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Copyright © 2009–2014, Texas Instruments Incorporated
SWRU191F – April 2009 – Revised April 2014
I/O Ports
SWRU191F – April 2009 – Revised April 2014
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