RF31
Register 0Bh. GPIO Configuration 0
Bit
D7
gpiodrv0[1:0]
R/w
D6
D5
pup0
R/w
D4
D3
D2
gpio0[4:0]
R/w
D1
D0
Name
Type
Reset value = 00000000
Bit
Name
gpiodrv0[1:0] GPIO Driving Capability Setting.
Pullup Resistor Enable on GPIO0.
Function
7:6
When set to 1 the a 200 KΩ resistor is connected internally between VDD
and the pin if the GPIO is configured as a digital input.
GPIO0 pin Function Select.
5
pup0
00000: Power-On-Reset (output)
00001: Wake-Up Timer: 1 when WUT has expired (output)
00010: Low Battery Detect: 1 when battery is below threshold setting (output)
00011: Direct Digital Input
00100: External Interrupt, falling edge (input)
00101: External Interrupt, rising edge (input)
00110: External Interrupt, state change (input)
00111: ADC Analog Input
01000: Reserved (Analog Test N Input)
01001: Reserved (Analog Test P Input)
01010: Direct Digital Output
01011: Reserved (Digital Test Output)
01100: Reserved (Analog Test N Output)
01101: Reserved (Analog Test P Output)
01110: Reference Voltage (output)
01111: RX Data CLK output to be used in conjunction with RX Data pin
(output)
4:0
gpio0[4:0]
10000: Reserved
10001: External Retransmission Request (input)
10010: Reserved
10011: Reserved
10100: RX Data (output)
10101: RX State (output)
10110: RX FIFO Almost Full (output)
10111: Antenna 1 Switch used for antenna diversity (output)
11000: Antenna 2 Switch used for antenna diversity (output)
11001: Valid Preamble Detected (output)
11010: Invalid Preamble Detected (output)
11011: Sync Word Detected (output)
11100: Clear Channel Assessment (output)
11101: VDD
else : GND
78
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