nRF24LE1 Nordic VLSI, nRF24LE1 Datasheet - Page 128

• Manufacturer Part Number: nRF24LE1
• Manufacturer: Nordic VLSI

nRF24LE1 Preliminary Product Specification
17.2
17.2.1
Each of the IO pins on nRF24LE1 has a generic control functionality that sets pin features for the GPIO of
the MCU.
The features offered by the pins include:
This functionality is multiplexed with the functionality of the PortCrossbar module which takes control and
configures the pins depending on the needs of the peripheral block connected. The pin circuitry of the
nRF24LE1 is shown in
The pins on the nRF24LE1 are connected by default to a pin Multiplexer (MUX) that is connected to the
GPIO registers of the MCU. Register Pn.m (n-port number, m - bit number) contains MCU GPIO data,
PDIRn.m register controls input/output direction and PCONn.m register controls pin features drive strength
and pull up/down resistors for each pin.
When the MCU enables one of the peripheral blocks of the nRF24LE1 the pin MUX disconnects the MCU
control of the pin and hands control over to the PortCrossbar module to set direction and pin features.
However, if the pin is operated as an analog input, the MCU must set the pin control registers PDIR and
PCON separately to prevent conflicts between pin configuration and the needs of the analog peripheral
blocks of the nRF24LE1.
The nRF24LE1 has one Pn.m , PnDIRm and PnCONn for each port. Pn.m and PnDIRm control only one
parameter each, this means that a write/read operation to them controls/reads the status of the port
directly. However, to control or read the features of a pin you use the PnCONm to write/read to one pin at a
time. The PnCON register contains an address for the pin, information on whether it is an input or an output
feature that is to be updated and the feature that is to be enabled.
The features available:
Example: If four pins in port 3 are set as inputs with the pull up resistor enabled, then this is done with one
write to P3DIR and four write operations to P3CON and only updating the pin address in P3CON for each
write.
Revision 1.1
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Digital or Analog
Configurable Direction
Configurable Drive Strength
Configurable Pull Up/Down
Output buffer on, normal drive strength
Output buffer on, high drive strength
Input buffer on, no pull up/down resistor
Input buffer on, pull up resistor
Input buffer on, pull down resistor
Input buffer off
Functional description
General purpose IO pin functionality
Figure
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