Texas Instruments CC2650DK 사용자 설명서
Vio
Pin (DIOx)
Pullup enable
Output enable (OE)
Output
Pulldown enable
Input enable (IE)
Input
I/O Pin
Figure 11-2. Generic I/O pin (Simplified)
11.10.2 Pin Configuration
The IOC lets software configure the pins based on the application requirements. The software can
configure different characteristic settings for any or all of the I/O pins. All of the following features, except
for output driver (output enable set in the [GPIO:DOE31_0] register), are controlled in the [IOC:IOCFGn]
registers:
configure different characteristic settings for any or all of the I/O pins. All of the following features, except
for output driver (output enable set in the [GPIO:DOE31_0] register), are controlled in the [IOC:IOCFGn]
registers:
•
Drive Strength ([IOC:IOCFGn.IOSTR])
Configures the drive strength and maximum current of an I/O pin. All I/O pins support 2 mA and 4 mA,
while five pins support up to 8 mA. By setting [IOC:IOCFGn.IOSTR] to 0x0, the drive strength is
automatically updated based upon inputs from the battery monitor, BATMON, to maintain the set drive
strength level at different battery voltages.
while five pins support up to 8 mA. By setting [IOC:IOCFGn.IOSTR] to 0x0, the drive strength is
automatically updated based upon inputs from the battery monitor, BATMON, to maintain the set drive
strength level at different battery voltages.
•
Pull ([IOC:IOCFGn.PULL_CTL])
Configures a weak pull on an I/O pin. The following can be set: pull-up, pull-down, or no pull. See the
data sheet for specific pullup and pulldown resistance.
data sheet for specific pullup and pulldown resistance.
•
Slew Control ([IOC:IOCFGn.SLEW_RED])
Sets high or low slew rate on an I/O pin.
•
Hysteresis ([IOC:IOCFGn.HYST_EN])
Enables or disables input hysteresis on an I/O pin.
•
Open-Source or Open-Drain Configuration ([IOC:IOCFGn.IOMODE])
Configures the pin as normal, open source, or open drain; all of these can be set to either inverted or
normal (noninverted).
normal (noninverted).
•
Interrupt and Edge Detection ([IOC:IOCFGn.EDGE_IRQ_EN] and [IOC:IOCFGn.EDGE_DET])
Enables interrupt triggered by edge detection on I/O pin. Different edge detection modes are
supported, and the possible modes are rising edge, falling edge, trigger on both rising and falling, or no
edge detection.
supported, and the possible modes are rising edge, falling edge, trigger on both rising and falling, or no
edge detection.
•
Input Driver [IOC:IOCFGn.IE]
Enables or disables the I/O input driver.
•
Output Driver (Depends on specific peripheral mapped to pin)
Enables or disables the I/O output driver.
874
I/O Control
SWCU117A – February 2015 – Revised March 2015
Copyright © 2015, Texas Instruments Incorporated