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CC2480
9.2.1
Unused I/O pins
Unused I/O pins should have a defined level
and not be left floating. One way to do this is to
leave the pin unconnected and configured with
pull-up resistor. This is also the state of all pins
after reset.
9.2.2
Low I/O Supply Voltage
In applications where the digital I/O power
supply voltage pin DVDD is below 2.6 V, the
SC bit should be set to 1 in order to obtain
output DC characteristics specified in section
5.14. See the CC2480 user guide [2] for a
description of how to do this.
9.2.3
General Purpose I/O
See the CC2480 user guide [2] for a description
of how to configure and use the GPIO pins.
The output drive strength is 4 mA on all
outputs, except for the two high-drive outputs,
GPIO0 and GPIO1, which each have ~20 mA
output drive strength.
When used as an input, the general purpose
I/O port pins can be configured to have a pull-
up, pull-down or tri-state mode of operation. By
default, after a reset, inputs are configured as
inputs with pull-up. Please note that GPIO0
and GPIO1 do not have pull-up or pull-down
capabilities.
In power modes PM2 and PM3 the I/O pins
retain the I/O mode and output value (if
applicable) that was set when PM2/3 was
entered
CC2480 Data Sheet SWRS074
Page 24 of 43
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