RF42/43
Register 0Ch. GPIO Configuration 2
Bit
D7
gpiodrv2[1:0]
R/w
D6
D5
pup2
R/w
D4
D3
D2
Gpio2[4:0]
R/w
D1
D0
Name
Type
Reset value = 00000000
Bit
Name
gpiodrv2[1:0] GPIO Driving Capability Setting.
Pullup Resistor Enable on GPIO2.
Function
7:6
When set to 1 the a 200 kresistor is connected internally between VDD and
the pin if the GPIO is configured as a digital input.
GPIO1 pin Function Select.
5
Pup2
00000: Inverted 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: TX Data CLK output to be used in conjunction with TX Data pin
(output)
4:0
gpio2[4:0]
10000: TX Data input for direct modulation (input)
10001: External Retransmission Request (input)
10010: TX State (output)
10011: TX FIFO Almost Full (output)
10100: Reserved
10101: Reserved
10110: Reserved
10111: Reserved
11000: Reserved
11001: Reserved
11010: Reserved
11011: Reserved
11100: Reserved
11101: VDD
else :
GND
68
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